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Add NimBLEAttValue class. (#67)

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This is a specialized container class to hold BLE attribute values.

- Removes the use of std::string previously used to store the values.
- Allows for setting/getting/notifying values from std::string, std::vector<uint8_t>, Arduino String, const char*, and uint8_t buffers.
- Has operators retrieve the value as std::string, Arduino String, std::vector<uint8_t>, uint8_t* or char pointers.
- Includes iterators and subscript/random access operator.
- Introduces a max length parameter to the creation of server characteristics/descriptors to limit the size of the memory footprint.
- Nearly Seamless integration with existing code.
- Adds a config option to enable/disable timestamp storage when the value is updated.
- Adds a config option to specify the initial size of the value container if not specified in the constructor.
This commit is contained in:
h2zero 2022-01-16 20:11:18 -07:00 committed by GitHub
parent be9cdc1ab6
commit e3ee082dd7
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17 changed files with 901 additions and 296 deletions
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19
Kconfig
View file

@ -50,4 +50,23 @@ config NIMBLE_CPP_ENABLE_ADVERTISMENT_TYPE_TEXT
while scanning as text messages in the debug log.
This will use approximately 250 bytes of flash memory.
config NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
bool "Enable timestamps to be stored with attribute values."
default "n"
help
Enabling this option will store the timestamp when an attribute value is updated.
This allows for checking the last update time using getTimeStamp()
or getValue(time_t*). If disabled, the timestamp returned from these functions will be 0.
Disabling timestamps will reduce the memory used for each value.
config NIMBLE_CPP_ATT_VALUE_INIT_LENGTH
int "Initial attribute value size (bytes) for empty values."
range 1 512
default 20
help
Sets the default allocation size (bytes) for each attribute if not specified
when the constructor is called. This is also the size used when a remote
characteristic or descriptor is constructed before a value is read/notifed.
Increasing this will reduce reallocations but increase memory footprint.
endmenu

18
docs/Command_line_config.md
View file

@ -6,6 +6,24 @@ Sets the number of simultaneous connections (esp controller max is 9)
- Default value is 3
<br/>
`CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED`
Enable/disable storing the timestamp when an attribute value is updated
This allows for checking the last update time using getTimeStamp() or getValue(time_t*)
If disabled, the timestamp returned from these functions will be 0.
Disabling timestamps will reduce the memory used for each value.
1 = Enabled, 0 = Disabled; Default = Disabled
<br/>
`CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH`
Set the default allocation size (bytes) for each attribute.
If not specified when the constructor is called. This is also the size used when a remote
characteristic or descriptor is constructed before a value is read/notifed.
Increasing this will reduce reallocations but increase memory footprint.
Default value is 20. Range: 1 : 512 (BLE_ATT_ATTR_MAX_LEN)
<br/>
`CONFIG_BT_NIMBLE_ATT_PREFERRED_MTU`
Sets the default MTU size.

447
src/NimBLEAttValue.h Normal file
View file

@ -0,0 +1,447 @@
/*
* NimBLEAttValue.h
*
* Created: on March 18, 2021
* Author H2zero
*
*/
#ifndef MAIN_NIMBLEATTVALUE_H_
#define MAIN_NIMBLEATTVALUE_H_
#include "nimconfig.h"
#if defined(CONFIG_BT_ENABLED)
#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
#include <Arduino.h>
#endif
#include "NimBLELog.h"
/**** FIX COMPILATION ****/
#undef min
#undef max
/**************************/
#include <string>
#include <vector>
#ifndef CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
# define CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED 0
#endif
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
# include <time.h>
#endif
#if !defined(CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH)
# define CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH 20
#elif CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH > BLE_ATT_ATTR_MAX_LEN
# error CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH cannot be larger than 512 (BLE_ATT_ATTR_MAX_LEN)
#elif CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH < 1
# error CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH cannot be less than 1; Range = 1 : 512
#endif
/* Used to determine if the type passed to a template has a c_str() and length() method. */
template <typename T, typename = void, typename = void>
struct Has_c_str_len : std::false_type {};
template <typename T>
struct Has_c_str_len<T, decltype(void(std::declval<T &>().c_str())),
decltype(void(std::declval<T &>().length()))> : std::true_type {};
/**
* @brief A specialized container class to hold BLE attribute values.
* @details This class is designed to be more memory efficient than using\n
* standard container types for value storage, while being convertable to\n
* many different container classes.
*/
class NimBLEAttValue
{
uint8_t* m_attr_value = nullptr;
uint16_t m_attr_max_len = 0;
uint16_t m_attr_len = 0;
uint16_t m_capacity = 0;
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
time_t m_timestamp = 0;
#endif
void deepCopy(const NimBLEAttValue & source);
public:
/**
* @brief Default constructor.
* @param[in] init_len The initial size in bytes.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(uint16_t init_len = CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
/**
* @brief Construct with an initial value from a buffer.
* @param value A pointer to the initial value to set.
* @param[in] len The size in bytes of the value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(const uint8_t *value, uint16_t len,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
/**
* @brief Construct with an initializer list.
* @param list An initializer list containing the initial value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(std::initializer_list<uint8_t> list,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
:NimBLEAttValue(list.begin(), (uint16_t)list.size(), max_len){}
/**
* @brief Construct with an initial value from a const char string.
* @param value A pointer to the initial value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(const char *value, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
:NimBLEAttValue((uint8_t*)value, (uint16_t)strlen(value), max_len){}
/**
* @brief Construct with an initial value from a std::string.
* @param str A std::string containing to the initial value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(const std::string str, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
:NimBLEAttValue((uint8_t*)str.data(), (uint16_t)str.length(), max_len){}
/**
* @brief Construct with an initial value from a std::vector<uint8_t>.
* @param vec A std::vector<uint8_t> containing to the initial value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(const std::vector<uint8_t> vec, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
:NimBLEAttValue(&vec[0], (uint16_t)vec.size(), max_len){}
#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
/**
* @brief Construct with an initial value from an Arduino String.
* @param str An Arduino String containing to the initial value to set.
* @param[in] max_len The max size in bytes that the value can be.
*/
NimBLEAttValue(const String str, uint16_t max_len = BLE_ATT_ATTR_MAX_LEN)
:NimBLEAttValue((uint8_t*)str.c_str(), str.length(), max_len){}
#endif
/** @brief Copy constructor */
NimBLEAttValue(const NimBLEAttValue & source) { deepCopy(source); }
/** @brief Move constructor */
NimBLEAttValue(NimBLEAttValue && source) { *this = std::move(source); }
/** @brief Destructor */
~NimBLEAttValue();
/** @brief Returns the max size in bytes */
uint16_t max_size() const { return m_attr_max_len; }
/** @brief Returns the currently allocated capacity in bytes */
uint16_t capacity() const { return m_capacity; }
/** @brief Returns the current length of the value in bytes */
uint16_t length() const { return m_attr_len; }
/** @brief Returns the current size of the value in bytes */
uint16_t size() const { return m_attr_len; }
/** @brief Returns a pointer to the internal buffer of the value */
const uint8_t* data() const { return m_attr_value; }
/** @brief Returns a pointer to the internal buffer of the value as a const char* */
const char* c_str() const { return (const char*)m_attr_value; }
/** @brief Iterator begin */
const uint8_t* begin() const { return m_attr_value; }
/** @brief Iterator end */
const uint8_t* end() const { return m_attr_value + m_attr_len; }
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
/** @brief Returns a timestamp of when the value was last updated */
time_t getTimeStamp() const { return m_timestamp; }
/** @brief Set the timestamp to the current time */
void setTimeStamp() { m_timestamp = time(nullptr); }
/**
* @brief Set the timestamp to the specified time
* @param[in] t The timestamp value to set
*/
void setTimeStamp(time_t t) { m_timestamp = t; }
#else
time_t getTimeStamp() const { return 0; }
void setTimeStamp() { }
void setTimeStamp(time_t t) { }
#endif
/**
* @brief Set the value from a buffer
* @param[in] value A ponter to a buffer containing the value.
* @param[in] len The length of the value in bytes.
* @returns True if successful.
*/
bool setValue(const uint8_t *value, uint16_t len);
/**
* @brief Set value to the value of const char*.
* @param [in] s A ponter to a const char value to set.
*/
bool setValue(const char* s) {
return setValue((uint8_t*)s, (uint16_t)strlen(s)); }
/**
* @brief Get a pointer to the value buffer with timestamp.
* @param[in] timestamp A ponter to a time_t variable to store the timestamp.
* @returns A pointer to the internal value buffer.
*/
const uint8_t* getValue(time_t *timestamp);
/**
* @brief Append data to the value.
* @param[in] value A ponter to a data buffer with the value to append.
* @param[in] len The length of the value to append in bytes.
* @returns A reference to the appended NimBLEAttValue.
*/
NimBLEAttValue& append(const uint8_t *value, uint16_t len);
/*********************** Template Functions ************************/
/**
* @brief Template to set value to the value of <type\>val.
* @param [in] s The <type\>value to set.
* @details Only used for types without a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<!Has_c_str_len<T>::value, bool>::type
#endif
setValue(const T &s) {
return setValue((uint8_t*)&s, sizeof(T));
}
/**
* @brief Template to set value to the value of <type\>val.
* @param [in] s The <type\>value to set.
* @details Only used if the <type\> has a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<Has_c_str_len<T>::value, bool>::type
#endif
setValue(const T & s) {
return setValue((uint8_t*)s.c_str(), (uint16_t)s.length());
}
/**
* @brief Template to return the value as a <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than\n
* <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is\n
* less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>getValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
if(!skipSizeCheck && size() < sizeof(T)) {
return T();
}
return *((T *)getValue(timestamp));
}
/*********************** Operators ************************/
/** @brief Subscript operator */
uint8_t operator [](int pos) const {
assert(pos < m_attr_len && "out of range"); return m_attr_value[pos]; }
/** @brief Operator; Get the value as a std::vector<uint8_t>. */
operator std::vector<uint8_t>() const {
return std::vector<uint8_t>(m_attr_value, m_attr_value + m_attr_len); }
/** @brief Operator; Get the value as a std::string. */
operator std::string() const {
return std::string((char*)m_attr_value, m_attr_len); }
/** @brief Operator; Get the value as a const uint8_t*. */
operator const uint8_t*() const { return m_attr_value; }
/** @brief Operator; Append another NimBLEAttValue. */
NimBLEAttValue& operator +=(const NimBLEAttValue & source) {
return append(source.data(), source.size()); }
/** @brief Operator; Set the value from a std::string source. */
NimBLEAttValue& operator =(const std::string & source) {
setValue((uint8_t*)source.data(), (uint16_t)source.size()); return *this; }
/** @brief Move assignment operator */
NimBLEAttValue& operator =(NimBLEAttValue && source);
/** @brief Copy assignment operator */
NimBLEAttValue& operator =(const NimBLEAttValue & source);
/** @brief Equality operator */
bool operator ==(const NimBLEAttValue & source) {
return (m_attr_len == source.size()) ?
memcmp(m_attr_value, source.data(), m_attr_len) == 0 : false; }
/** @brief Inequality operator */
bool operator !=(const NimBLEAttValue & source){ return !(*this == source); }
#ifdef NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
/** @brief Operator; Get the value as an Arduino String value. */
operator String() const { return String((char*)m_attr_value); }
#endif
};
inline NimBLEAttValue::NimBLEAttValue(uint16_t init_len, uint16_t max_len) {
m_attr_value = (uint8_t*)calloc(init_len + 1, 1);
assert(m_attr_value && "No Mem");
m_attr_max_len = std::min(BLE_ATT_ATTR_MAX_LEN, (int)max_len);
m_attr_len = 0;
m_capacity = init_len;
setTimeStamp(0);
}
inline NimBLEAttValue::NimBLEAttValue(const uint8_t *value, uint16_t len, uint16_t max_len)
: NimBLEAttValue(len, max_len) {
memcpy(m_attr_value, value, len);
m_attr_value[len] = '\0';
m_attr_len = len;
}
inline NimBLEAttValue::~NimBLEAttValue() {
if(m_attr_value != nullptr) {
free(m_attr_value);
}
}
inline NimBLEAttValue& NimBLEAttValue::operator =(NimBLEAttValue && source) {
if (this != &source){
free(m_attr_value);
m_attr_value = source.m_attr_value;
m_attr_max_len = source.m_attr_max_len;
m_attr_len = source.m_attr_len;
m_capacity = source.m_capacity;
setTimeStamp(source.getTimeStamp());
source.m_attr_value = nullptr;
}
return *this;
}
inline NimBLEAttValue& NimBLEAttValue::operator =(const NimBLEAttValue & source) {
if (this != &source) {
deepCopy(source);
}
return *this;
}
inline void NimBLEAttValue::deepCopy(const NimBLEAttValue & source) {
uint8_t* res = (uint8_t*)realloc( m_attr_value, source.m_capacity + 1);
assert(res && "deepCopy: realloc failed");
ble_npl_hw_enter_critical();
m_attr_value = res;
m_attr_max_len = source.m_attr_max_len;
m_attr_len = source.m_attr_len;
m_capacity = source.m_capacity;
setTimeStamp(source.getTimeStamp());
memcpy(m_attr_value, source.m_attr_value, m_attr_len + 1);
ble_npl_hw_exit_critical(0);
}
inline const uint8_t* NimBLEAttValue::getValue(time_t *timestamp) {
if(timestamp != nullptr) {
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
*timestamp = m_timestamp;
#else
*timestamp = 0;
#endif
}
return m_attr_value;
}
inline bool NimBLEAttValue::setValue(const uint8_t *value, uint16_t len) {
if (len > m_attr_max_len) {
NIMBLE_LOGE("NimBLEAttValue", "value exceeds max, len=%u, max=%u",
len, m_attr_max_len);
return false;
}
uint8_t *res = m_attr_value;
if (len > m_capacity) {
res = (uint8_t*)realloc(m_attr_value, (len + 1));
m_capacity = len;
}
assert(res && "setValue: realloc failed");
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
time_t t = time(nullptr);
#else
time_t t = 0;
#endif
ble_npl_hw_enter_critical();
m_attr_value = res;
memcpy(m_attr_value, value, len);
m_attr_value[len] = '\0';
m_attr_len = len;
setTimeStamp(t);
ble_npl_hw_exit_critical(0);
return true;
}
inline NimBLEAttValue& NimBLEAttValue::append(const uint8_t *value, uint16_t len) {
if (len < 1) {
return *this;
}
if ((m_attr_len + len) > m_attr_max_len) {
NIMBLE_LOGE("NimBLEAttValue", "val > max, len=%u, max=%u",
len, m_attr_max_len);
return *this;
}
uint8_t* res = m_attr_value;
uint16_t new_len = m_attr_len + len;
if (new_len > m_capacity) {
res = (uint8_t*)realloc(m_attr_value, (new_len + 1));
m_capacity = new_len;
}
assert(res && "append: realloc failed");
#if CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED
time_t t = time(nullptr);
#else
time_t t = 0;
#endif
ble_npl_hw_enter_critical();
m_attr_value = res;
memcpy(m_attr_value + m_attr_len, value, len);
m_attr_len = new_len;
m_attr_value[m_attr_len] = '\0';
setTimeStamp(t);
ble_npl_hw_exit_critical(0);
return *this;
}
#endif /*(CONFIG_BT_ENABLED) */
#endif /* MAIN_NIMBLEATTVALUE_H_ */

126
src/NimBLECharacteristic.cpp
View file

@ -30,26 +30,29 @@ static const char* LOG_TAG = "NimBLECharacteristic";
* @brief Construct a characteristic
* @param [in] uuid - UUID (const char*) for the characteristic.
* @param [in] properties - Properties for the characteristic.
* @param [in] max_len - The maximum length in bytes that the characteristic value can hold. (Default: 512 bytes for esp32, 20 for all others).
* @param [in] pService - pointer to the service instance this characteristic belongs to.
*/
NimBLECharacteristic::NimBLECharacteristic(const char* uuid, uint16_t properties, NimBLEService* pService)
: NimBLECharacteristic(NimBLEUUID(uuid), properties, pService) {
NimBLECharacteristic::NimBLECharacteristic(const char* uuid, uint16_t properties,
uint16_t max_len, NimBLEService* pService)
: NimBLECharacteristic(NimBLEUUID(uuid), properties, max_len, pService) {
}
/**
* @brief Construct a characteristic
* @param [in] uuid - UUID for the characteristic.
* @param [in] properties - Properties for the characteristic.
* @param [in] max_len - The maximum length in bytes that the characteristic value can hold. (Default: 512 bytes for esp32, 20 for all others).
* @param [in] pService - pointer to the service instance this characteristic belongs to.
*/
NimBLECharacteristic::NimBLECharacteristic(const NimBLEUUID &uuid, uint16_t properties, NimBLEService* pService) {
NimBLECharacteristic::NimBLECharacteristic(const NimBLEUUID &uuid, uint16_t properties,
uint16_t max_len, NimBLEService* pService)
: m_value(std::min(CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH , (int)max_len), max_len) {
m_uuid = uuid;
m_handle = NULL_HANDLE;
m_properties = properties;
m_pCallbacks = &defaultCallback;
m_pService = pService;
m_value = "";
m_timestamp = 0;
m_removed = 0;
} // NimBLECharacteristic
@ -231,17 +234,14 @@ NimBLEUUID NimBLECharacteristic::getUUID() {
/**
* @brief Retrieve the current value of the characteristic.
* @return A std::string containing the current characteristic value.
* @return The NimBLEAttValue containing the current characteristic value.
*/
std::string NimBLECharacteristic::getValue(time_t *timestamp) {
ble_npl_hw_enter_critical();
std::string retVal = m_value;
NimBLEAttValue NimBLECharacteristic::getValue(time_t *timestamp) {
if(timestamp != nullptr) {
*timestamp = m_timestamp;
m_value.getValue(timestamp);
}
ble_npl_hw_exit_critical(0);
return retVal;
return m_value;
} // getValue
@ -250,10 +250,7 @@ std::string NimBLECharacteristic::getValue(time_t *timestamp) {
* @return The length of the current characteristic data.
*/
size_t NimBLECharacteristic::getDataLength() {
ble_npl_hw_enter_critical();
size_t len = m_value.length();
ble_npl_hw_exit_critical(0);
return len;
return m_value.size();
}
@ -286,25 +283,26 @@ int NimBLECharacteristic::handleGapEvent(uint16_t conn_handle, uint16_t attr_han
}
ble_npl_hw_enter_critical();
rc = os_mbuf_append(ctxt->om, (uint8_t*)pCharacteristic->m_value.data(),
pCharacteristic->m_value.length());
rc = os_mbuf_append(ctxt->om, pCharacteristic->m_value.data(), pCharacteristic->m_value.size());
ble_npl_hw_exit_critical(0);
return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
}
case BLE_GATT_ACCESS_OP_WRITE_CHR: {
if (ctxt->om->om_len > BLE_ATT_ATTR_MAX_LEN) {
uint16_t att_max_len = pCharacteristic->m_value.max_size();
if (ctxt->om->om_len > att_max_len) {
return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
}
uint8_t buf[BLE_ATT_ATTR_MAX_LEN];
uint8_t buf[att_max_len];
size_t len = ctxt->om->om_len;
memcpy(buf, ctxt->om->om_data,len);
os_mbuf *next;
next = SLIST_NEXT(ctxt->om, om_next);
while(next != NULL){
if((len + next->om_len) > BLE_ATT_ATTR_MAX_LEN) {
if((len + next->om_len) > att_max_len) {
return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
}
memcpy(&buf[len], next->om_data, next->om_len);
@ -384,36 +382,58 @@ void NimBLECharacteristic::setSubscribe(struct ble_gap_event *event) {
/**
* @brief Send an indication.\n
* An indication is a transmission of up to the first 20 bytes of the characteristic value.\n
* An indication will block waiting for a positive confirmation from the client.
* @brief Send an indication.
*/
void NimBLECharacteristic::indicate() {
NIMBLE_LOGD(LOG_TAG, ">> indicate: length: %d", getDataLength());
notify(false);
NIMBLE_LOGD(LOG_TAG, "<< indicate");
} // indicate
/**
* @brief Send a notification.\n
* A notification is a transmission of up to the first 20 bytes of the characteristic value.\n
* A notification will not block; it is a fire and forget.
* @brief Send an indication.
* @param[in] value A pointer to the data to send.
* @param[in] length The length of the data to send.
*/
void NimBLECharacteristic::indicate(const uint8_t* value, size_t length) {
notify(value, length, false);
} // indicate
/**
* @brief Send an indication.
* @param[in] value A std::vector<uint8_t> containing the value to send as the notification value.
*/
void NimBLECharacteristic::indicate(const std::vector<uint8_t>& value) {
notify(value.data(), value.size(), false);
} // indicate
/**
* @brief Send a notification or indication.
* @param[in] is_notification if true sends a notification, false sends an indication.
*/
void NimBLECharacteristic::notify(bool is_notification) {
notify(getValue(), is_notification);
}
notify(m_value.data(), m_value.length(), is_notification);
} // notify
/**
* @brief Send a notification.\n
* A notification is a transmission of up to the first 20 bytes of the characteristic value.\n
* A notification will not block; it is a fire and forget.
* @param[in] value An optional value to send as the notification, else the current characteristic value is used.
* @brief Send a notification or indication.
* @param[in] value A std::vector<uint8_t> containing the value to send as the notification value.
* @param[in] is_notification if true sends a notification, false sends an indication.
*/
void NimBLECharacteristic::notify(std::string value, bool is_notification) {
size_t length = value.length();
void NimBLECharacteristic::notify(const std::vector<uint8_t>& value, bool is_notification) {
notify(value.data(), value.size(), is_notification);
} // notify
/**
* @brief Send a notification or indication.
* @param[in] value A pointer to the data to send.
* @param[in] length The length of the data to send.
* @param[in] is_notification if true sends a notification, false sends an indication.
*/
void NimBLECharacteristic::notify(const uint8_t* value, size_t length, bool is_notification) {
NIMBLE_LOGD(LOG_TAG, ">> notify: length: %d", length);
if(!(m_properties & NIMBLE_PROPERTY::NOTIFY) &&
@ -472,7 +492,7 @@ void NimBLECharacteristic::notify(std::string value, bool is_notification) {
// don't create the m_buf until we are sure to send the data or else
// we could be allocating a buffer that doesn't get released.
// We also must create it in each loop iteration because it is consumed with each host call.
os_mbuf *om = ble_hs_mbuf_from_flat((uint8_t*)value.data(), length);
os_mbuf *om = ble_hs_mbuf_from_flat(value, length);
if(!is_notification && (m_properties & NIMBLE_PROPERTY::INDICATE)) {
if(!NimBLEDevice::getServer()->setIndicateWait(it.first)) {
@ -516,39 +536,29 @@ NimBLECharacteristicCallbacks* NimBLECharacteristic::getCallbacks() {
/**
* @brief Set the value of the characteristic.
* @param [in] data The data to set for the characteristic.
* @param [in] length The length of the data in bytes.
* @brief Set the value of the characteristic from a data buffer .
* @param [in] data The data buffer to set for the characteristic.
* @param [in] length The number of bytes in the data buffer.
*/
void NimBLECharacteristic::setValue(const uint8_t* data, size_t length) {
#if CONFIG_NIMBLE_CPP_LOG_LEVEL >= 4
char* pHex = NimBLEUtils::buildHexData(nullptr, data, length);
NIMBLE_LOGD(LOG_TAG, ">> setValue: length=%d, data=%s, characteristic UUID=%s", length, pHex, getUUID().toString().c_str());
NIMBLE_LOGD(LOG_TAG, ">> setValue: length=%d, data=%s, characteristic UUID=%s",
length, pHex, getUUID().toString().c_str());
free(pHex);
#endif
if (length > BLE_ATT_ATTR_MAX_LEN) {
NIMBLE_LOGE(LOG_TAG, "Size %d too large, must be no bigger than %d", length, BLE_ATT_ATTR_MAX_LEN);
return;
}
time_t t = time(nullptr);
ble_npl_hw_enter_critical();
m_value = std::string((char*)data, length);
m_timestamp = t;
ble_npl_hw_exit_critical(0);
m_value.setValue(data, length);
NIMBLE_LOGD(LOG_TAG, "<< setValue");
} // setValue
/**
* @brief Set the value of the characteristic from string data.\n
* We set the value of the characteristic from the bytes contained in the string.
* @param [in] value the std::string value of the characteristic.
* @brief Set the value of the characteristic from a `std::vector<uint8_t>`.\n
* @param [in] vec The std::vector<uint8_t> reference to set the characteristic value from.
*/
void NimBLECharacteristic::setValue(const std::string &value) {
setValue((uint8_t*)(value.data()), value.length());
void NimBLECharacteristic::setValue(const std::vector<uint8_t>& vec) {
return setValue((uint8_t*)&vec[0], vec.size());
}// setValue

109
src/NimBLECharacteristic.h
View file

@ -44,6 +44,7 @@ typedef enum {
#include "NimBLEService.h"
#include "NimBLEDescriptor.h"
#include "NimBLEAttValue.h"
#include <string>
#include <vector>
@ -65,11 +66,13 @@ public:
uint16_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN,
NimBLEService* pService = nullptr);
NimBLECharacteristic(const NimBLEUUID &uuid,
uint16_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN,
NimBLEService* pService = nullptr);
~NimBLECharacteristic();
@ -77,66 +80,93 @@ public:
uint16_t getHandle();
NimBLEUUID getUUID();
std::string toString();
void setCallbacks(NimBLECharacteristicCallbacks* pCallbacks);
NimBLECharacteristicCallbacks*
getCallbacks();
void indicate();
void indicate(const uint8_t* value, size_t length);
void indicate(const std::vector<uint8_t>& value);
void notify(bool is_notification = true);
void notify(std::string value, bool is_notification = true);
void notify(const uint8_t* value, size_t length, bool is_notification = true);
void notify(const std::vector<uint8_t>& value, bool is_notification = true);
size_t getSubscribedCount();
NimBLEDescriptor* createDescriptor(const char* uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = 100);
NimBLEDescriptor* createDescriptor(const NimBLEUUID &uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = 100);
void addDescriptor(NimBLEDescriptor *pDescriptor);
NimBLEDescriptor* getDescriptorByUUID(const char* uuid);
NimBLEDescriptor* getDescriptorByUUID(const NimBLEUUID &uuid);
NimBLEDescriptor* getDescriptorByHandle(uint16_t handle);
void removeDescriptor(NimBLEDescriptor *pDescriptor, bool deleteDsc = false);
std::string getValue(time_t *timestamp = nullptr);
NimBLEService* getService();
uint16_t getProperties();
NimBLEAttValue getValue(time_t *timestamp = nullptr);
size_t getDataLength();
void setValue(const uint8_t* data, size_t size);
void setValue(const std::vector<uint8_t>& vec);
void setCallbacks(NimBLECharacteristicCallbacks* pCallbacks);
NimBLEDescriptor* createDescriptor(const char* uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);;
NimBLEDescriptor* createDescriptor(const NimBLEUUID &uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
NimBLECharacteristicCallbacks* getCallbacks();
/*********************** Template Functions ************************/
/**
* @brief A template to convert the characteristic data to <type\>.
* @brief Template to set the characteristic value to <type\>val.
* @param [in] s The value to set.
*/
template<typename T>
void setValue(const T &s) { m_value.setValue<T>(s); }
/**
* @brief Template to convert the characteristic data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
* less than <tt>sizeof(<type\>)</tt>.
* @param [in] timestamp (Optional) A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck (Optional) If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>getValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
std::string value = getValue();
if(!skipSizeCheck && value.size() < sizeof(T)) return T();
const char *pData = value.data();
return *((T *)pData);
return m_value.getValue<T>(timestamp, skipSizeCheck);
}
void setValue(const uint8_t* data, size_t size);
void setValue(const std::string &value);
/**
* @brief Convenience template to set the characteristic value to <type\>val.
* @param [in] s The value to set.
* @brief Template to send a notification from a class type that has a c_str() and length() method.
* @tparam T The a reference to a class containing the data to send.
* @param[in] value The <type\>value to set.
* @param[in] is_notification if true sends a notification, false sends an indication.
* @details Only used if the <type\> has a `c_str()` method.
*/
template<typename T>
void setValue(const T &s) {
setValue((uint8_t*)&s, sizeof(T));
#ifdef _DOXYGEN_
void
#else
typename std::enable_if<Has_c_str_len<T>::value, void>::type
#endif
notify(const T& value, bool is_notification = true) {
notify((uint8_t*)value.c_str(), value.length(), is_notification);
}
NimBLEService* getService();
uint16_t getProperties();
/**
* @brief Template to send an indication from a class type that has a c_str() and length() method.
* @tparam T The a reference to a class containing the data to send.
* @param[in] value The <type\>value to set.
* @details Only used if the <type\> has a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
void
#else
typename std::enable_if<Has_c_str_len<T>::value, void>::type
#endif
indicate(const T& value) {
indicate((uint8_t*)value.c_str(), value.length());
}
private:
@ -153,9 +183,8 @@ private:
uint16_t m_properties;
NimBLECharacteristicCallbacks* m_pCallbacks;
NimBLEService* m_pService;
std::string m_value;
NimBLEAttValue m_value;
std::vector<NimBLEDescriptor*> m_dscVec;
time_t m_timestamp;
uint8_t m_removed;
std::vector<std::pair<uint16_t, uint16_t>> m_subscribedVec;

12
src/NimBLEClient.cpp
View file

@ -768,11 +768,11 @@ int NimBLEClient::serviceDiscoveredCB(
* @param [in] characteristicUUID The characteristic whose value we wish to read.
* @returns characteristic value or an empty string if not found
*/
std::string NimBLEClient::getValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID) {
NimBLEAttValue NimBLEClient::getValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID) {
NIMBLE_LOGD(LOG_TAG, ">> getValue: serviceUUID: %s, characteristicUUID: %s",
serviceUUID.toString().c_str(), characteristicUUID.toString().c_str());
std::string ret = "";
NimBLEAttValue ret;
NimBLERemoteService* pService = getService(serviceUUID);
if(pService != nullptr) {
@ -796,7 +796,7 @@ std::string NimBLEClient::getValue(const NimBLEUUID &serviceUUID, const NimBLEUU
* @returns true if successful otherwise false
*/
bool NimBLEClient::setValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID,
const std::string &value, bool response)
const NimBLEAttValue &value, bool response)
{
NIMBLE_LOGD(LOG_TAG, ">> setValue: serviceUUID: %s, characteristicUUID: %s",
serviceUUID.toString().c_str(), characteristicUUID.toString().c_str());
@ -976,11 +976,7 @@ uint16_t NimBLEClient::getMTU() {
(*characteristic)->toString().c_str());
uint32_t data_len = OS_MBUF_PKTLEN(event->notify_rx.om);
time_t t = time(nullptr);
ble_npl_hw_enter_critical();
(*characteristic)->m_value = std::string((char *)event->notify_rx.om->om_data, data_len);
(*characteristic)->m_timestamp = t;
ble_npl_hw_exit_critical(0);
(*characteristic)->m_value.setValue(event->notify_rx.om->om_data, data_len);
if ((*characteristic)->m_notifyCallback != nullptr) {
NIMBLE_LOGD(LOG_TAG, "Invoking callback for notification on characteristic %s",

5
src/NimBLEClient.h
View file

@ -21,6 +21,7 @@
#include "NimBLEUUID.h"
#include "NimBLEUtils.h"
#include "NimBLEConnInfo.h"
#include "NimBLEAttValue.h"
#include "NimBLEAdvertisedDevice.h"
#include "NimBLERemoteService.h"
@ -51,9 +52,9 @@ public:
NimBLERemoteService* getService(const NimBLEUUID &uuid);
void deleteServices();
size_t deleteService(const NimBLEUUID &uuid);
std::string getValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID);
NimBLEAttValue getValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID);
bool setValue(const NimBLEUUID &serviceUUID, const NimBLEUUID &characteristicUUID,
const std::string &value, bool response = false);
const NimBLEAttValue &value, bool response = false);
NimBLERemoteCharacteristic* getCharacteristic(const uint16_t handle);
bool isConnected();
void setClientCallbacks(NimBLEClientCallbacks *pClientCallbacks,

64
src/NimBLEDescriptor.cpp
View file

@ -28,27 +28,32 @@ static NimBLEDescriptorCallbacks defaultCallbacks;
/**
* @brief NimBLEDescriptor constructor.
* @brief Construct a descriptor
* @param [in] uuid - UUID (const char*) for the descriptor.
* @param [in] properties - Properties for the descriptor.
* @param [in] max_len - The maximum length in bytes that the descriptor value can hold. (Default: 512 bytes for esp32, 20 for all others).
* @param [in] pCharacteristic - pointer to the characteristic instance this descriptor belongs to.
*/
NimBLEDescriptor::NimBLEDescriptor(const char* uuid, uint16_t properties, uint16_t max_len,
NimBLECharacteristic* pCharacteristic)
: NimBLEDescriptor(NimBLEUUID(uuid), max_len, properties, pCharacteristic) {
: NimBLEDescriptor(NimBLEUUID(uuid), properties, max_len, pCharacteristic) {
}
/**
* @brief NimBLEDescriptor constructor.
* @brief Construct a descriptor
* @param [in] uuid - UUID (const char*) for the descriptor.
* @param [in] properties - Properties for the descriptor.
* @param [in] max_len - The maximum length in bytes that the descriptor value can hold. (Default: 512 bytes for esp32, 20 for all others).
* @param [in] pCharacteristic - pointer to the characteristic instance this descriptor belongs to.
*/
NimBLEDescriptor::NimBLEDescriptor(NimBLEUUID uuid, uint16_t properties, uint16_t max_len,
NimBLECharacteristic* pCharacteristic)
{
: m_value(std::min(CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH , (int)max_len), max_len) {
m_uuid = uuid;
m_value.attr_len = 0; // Initial length is 0.
m_value.attr_max_len = max_len; // Maximum length of the data.
m_handle = NULL_HANDLE; // Handle is initially unknown.
m_pCharacteristic = pCharacteristic;
m_pCallbacks = &defaultCallbacks; // No initial callback.
m_value.attr_value = (uint8_t*) calloc(max_len,1); // Allocate storage for the value.
m_properties = 0;
m_removed = 0;
@ -84,7 +89,6 @@ NimBLEDescriptor::NimBLEDescriptor(NimBLEUUID uuid, uint16_t properties, uint16_
* @brief NimBLEDescriptor destructor.
*/
NimBLEDescriptor::~NimBLEDescriptor() {
free(m_value.attr_value); // Release the storage we created in the constructor.
} // ~NimBLEDescriptor
/**
@ -101,7 +105,7 @@ uint16_t NimBLEDescriptor::getHandle() {
* @return The length (in bytes) of the value of this descriptor.
*/
size_t NimBLEDescriptor::getLength() {
return m_value.attr_len;
return m_value.size();
} // getLength
@ -115,10 +119,14 @@ NimBLEUUID NimBLEDescriptor::getUUID() {
/**
* @brief Get the value of this descriptor.
* @return A pointer to the value of this descriptor.
* @return The NimBLEAttValue of this descriptor.
*/
uint8_t* NimBLEDescriptor::getValue() {
return m_value.attr_value;
NimBLEAttValue NimBLEDescriptor::getValue(time_t *timestamp) {
if (timestamp != nullptr) {
m_value.getValue(timestamp);
}
return m_value;
} // getValue
@ -127,7 +135,7 @@ uint8_t* NimBLEDescriptor::getValue() {
* @return A std::string instance containing a copy of the descriptor's value.
*/
std::string NimBLEDescriptor::getStringValue() {
return std::string((char *) m_value.attr_value, m_value.attr_len);
return std::string(m_value);
}
@ -163,23 +171,25 @@ int NimBLEDescriptor::handleGapEvent(uint16_t conn_handle, uint16_t attr_handle,
}
ble_npl_hw_enter_critical();
rc = os_mbuf_append(ctxt->om, pDescriptor->getValue(), pDescriptor->getLength());
rc = os_mbuf_append(ctxt->om, pDescriptor->m_value.data(), pDescriptor->m_value.size());
ble_npl_hw_exit_critical(0);
return rc == 0 ? 0 : BLE_ATT_ERR_INSUFFICIENT_RES;
}
case BLE_GATT_ACCESS_OP_WRITE_DSC: {
if (ctxt->om->om_len > pDescriptor->m_value.attr_max_len) {
uint16_t att_max_len = pDescriptor->m_value.max_size();
if (ctxt->om->om_len > att_max_len) {
return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
}
uint8_t buf[pDescriptor->m_value.attr_max_len];
uint8_t buf[att_max_len];
size_t len = ctxt->om->om_len;
memcpy(buf, ctxt->om->om_data,len);
os_mbuf *next;
next = SLIST_NEXT(ctxt->om, om_next);
while(next != NULL){
if((len + next->om_len) > pDescriptor->m_value.attr_max_len) {
if((len + next->om_len) > att_max_len) {
return BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
}
memcpy(&buf[len], next->om_data, next->om_len);
@ -231,27 +241,19 @@ void NimBLEDescriptor::setHandle(uint16_t handle) {
* @param [in] length The length of the data in bytes.
*/
void NimBLEDescriptor::setValue(const uint8_t* data, size_t length) {
if (length > m_value.attr_max_len) {
NIMBLE_LOGE(LOG_TAG, "Size %d too large, must be no bigger than %d", length, m_value.attr_max_len);
return;
}
ble_npl_hw_enter_critical();
m_value.attr_len = length;
memcpy(m_value.attr_value, data, length);
ble_npl_hw_exit_critical(0);
m_value.setValue(data, length);
} // setValue
/**
* @brief Set the value of the descriptor.
* @param [in] value The value of the descriptor in string form.
* @brief Set the value of the descriptor from a `std::vector<uint8_t>`.\n
* @param [in] vec The std::vector<uint8_t> reference to set the descriptor value from.
*/
void NimBLEDescriptor::setValue(const std::string &value) {
setValue((uint8_t*) value.data(), value.length());
void NimBLEDescriptor::setValue(const std::vector<uint8_t>& vec) {
return setValue((uint8_t*)&vec[0], vec.size());
} // setValue
/**
* @brief Set the characteristic this descriptor belongs to.
* @param [in] pChar A pointer to the characteristic this descriptior belongs to.

37
src/NimBLEDescriptor.h
View file

@ -20,17 +20,10 @@
#include "NimBLECharacteristic.h"
#include "NimBLEUUID.h"
#include "NimBLEAttValue.h"
#include <string>
typedef struct
{
uint16_t attr_max_len; /*!< attribute max value length */
uint16_t attr_len; /*!< attribute current value length */
uint8_t *attr_value; /*!< the pointer to attribute value */
} attr_value_t;
class NimBLEService;
class NimBLECharacteristic;
class NimBLEDescriptorCallbacks;
@ -54,24 +47,36 @@ public:
uint16_t getHandle();
NimBLEUUID getUUID();
std::string toString();
void setCallbacks(NimBLEDescriptorCallbacks* pCallbacks);
NimBLECharacteristic* getCharacteristic();
size_t getLength();
uint8_t* getValue();
NimBLEAttValue getValue(time_t *timestamp = nullptr);
std::string getStringValue();
void setValue(const uint8_t* data, size_t size);
void setValue(const std::string &value);
NimBLECharacteristic* getCharacteristic();
void setValue(const std::vector<uint8_t>& vec);
/*********************** Template Functions ************************/
/**
* @brief Convenience template to set the descriptor value to <type\>val.
* @brief Template to set the characteristic value to <type\>val.
* @param [in] s The value to set.
*/
template<typename T>
void setValue(const T &s) {
setValue((uint8_t*)&s, sizeof(T));
void setValue(const T &s) { m_value.setValue<T>(s); }
/**
* @brief Template to convert the descriptor data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp (Optional) A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck (Optional) If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>getValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
return m_value.getValue<T>(timestamp, skipSizeCheck);
}
private:
@ -89,7 +94,7 @@ private:
NimBLEDescriptorCallbacks* m_pCallbacks;
NimBLECharacteristic* m_pCharacteristic;
uint8_t m_properties;
attr_value_t m_value;
NimBLEAttValue m_value;
uint8_t m_removed;
}; // NimBLEDescriptor

54
src/NimBLERemoteCharacteristic.cpp
View file

@ -58,7 +58,6 @@ static const char* LOG_TAG = "NimBLERemoteCharacteristic";
m_charProp = chr->properties;
m_pRemoteService = pRemoteService;
m_notifyCallback = nullptr;
m_timestamp = 0;
NIMBLE_LOGD(LOG_TAG, "<< NimBLERemoteCharacteristic(): %s", m_uuid.toString().c_str());
} // NimBLERemoteCharacteristic
@ -414,15 +413,12 @@ NimBLEUUID NimBLERemoteCharacteristic::getUUID() {
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @return The value of the remote characteristic.
*/
std::string NimBLERemoteCharacteristic::getValue(time_t *timestamp) {
ble_npl_hw_enter_critical();
std::string value = m_value;
NimBLEAttValue NimBLERemoteCharacteristic::getValue(time_t *timestamp) {
if(timestamp != nullptr) {
*timestamp = m_timestamp;
*timestamp = m_value.getTimeStamp();
}
ble_npl_hw_exit_critical(0);
return value;
return m_value;
}
@ -470,12 +466,12 @@ float NimBLERemoteCharacteristic::readFloat() {
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @return The value of the remote characteristic.
*/
std::string NimBLERemoteCharacteristic::readValue(time_t *timestamp) {
NimBLEAttValue NimBLERemoteCharacteristic::readValue(time_t *timestamp) {
NIMBLE_LOGD(LOG_TAG, ">> readValue(): uuid: %s, handle: %d 0x%.2x",
getUUID().toString().c_str(), getHandle(), getHandle());
NimBLEClient* pClient = getRemoteService()->getClient();
std::string value;
NimBLEAttValue value;
if (!pClient->isConnected()) {
NIMBLE_LOGE(LOG_TAG, "Disconnected");
@ -526,14 +522,11 @@ std::string NimBLERemoteCharacteristic::readValue(time_t *timestamp) {
}
} while(rc != 0 && retryCount--);
time_t t = time(nullptr);
ble_npl_hw_enter_critical();
value.setTimeStamp();
m_value = value;
m_timestamp = t;
if(timestamp != nullptr) {
*timestamp = m_timestamp;
*timestamp = value.getTimeStamp();
}
ble_npl_hw_exit_critical(0);
NIMBLE_LOGD(LOG_TAG, "<< readValue length: %d rc=%d", value.length(), rc);
return value;
@ -558,17 +551,17 @@ int NimBLERemoteCharacteristic::onReadCB(uint16_t conn_handle,
NIMBLE_LOGI(LOG_TAG, "Read complete; status=%d conn_handle=%d", error->status, conn_handle);
std::string *strBuf = (std::string*)pTaskData->buf;
NimBLEAttValue *valBuf = (NimBLEAttValue*)pTaskData->buf;
int rc = error->status;
if(rc == 0) {
if(attr) {
uint16_t data_len = OS_MBUF_PKTLEN(attr->om);
if(((*strBuf).length() + data_len) > BLE_ATT_ATTR_MAX_LEN) {
if((valBuf->size() + data_len) > BLE_ATT_ATTR_MAX_LEN) {
rc = BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
} else {
NIMBLE_LOGD(LOG_TAG, "Got %u bytes", data_len);
(*strBuf) += std::string((char*) attr->om->om_data, data_len);
valBuf->append(attr->om->om_data, data_len);
return 0;
}
}
@ -719,22 +712,33 @@ std::string NimBLERemoteCharacteristic::toString() {
/**
* @brief Write the new value for the characteristic.
* @param [in] newValue The new value to write.
* @param [in] response Do we expect a response?
* @return false if not connected or cant perform write for some reason.
* @brief Write a new value to the remote characteristic from a std::vector<uint8_t>.
* @param [in] vec A std::vector<uint8_t> value to write to the remote characteristic.
* @param [in] response Whether we require a response from the write.
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteCharacteristic::writeValue(const std::string &newValue, bool response) {
return writeValue((uint8_t*)newValue.c_str(), newValue.length(), response);
bool NimBLERemoteCharacteristic::writeValue(const std::vector<uint8_t>& vec, bool response) {
return writeValue((uint8_t*)&vec[0], vec.size(), response);
} // writeValue
/**
* @brief Write the new value for the characteristic from a data buffer.
* @brief Write a new value to the remote characteristic from a const char*.
* @param [in] char_s A character string to write to the remote characteristic.
* @param [in] response Whether we require a response from the write.
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteCharacteristic::writeValue(const char* char_s, bool response) {
return writeValue((uint8_t*)char_s, strlen(char_s), response);
} // writeValue
/**
* @brief Write a new value to the remote characteristic from a data buffer.
* @param [in] data A pointer to a data buffer.
* @param [in] length The length of the data in the data buffer.
* @param [in] response Whether we require a response from the write.
* @return false if not connected or cant perform write for some reason.
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteCharacteristic::writeValue(const uint8_t* data, size_t length, bool response) {

110
src/NimBLERemoteCharacteristic.h
View file

@ -23,6 +23,7 @@
#include <vector>
#include <functional>
#include "NimBLELog.h"
class NimBLERemoteService;
class NimBLERemoteDescriptor;
@ -60,47 +61,15 @@ public:
uint16_t getHandle();
uint16_t getDefHandle();
NimBLEUUID getUUID();
std::string readValue(time_t *timestamp = nullptr);
/**
* @brief A template to convert the remote characteristic data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
* less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>readValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T readValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
std::string value = readValue(timestamp);
if(!skipSizeCheck && value.size() < sizeof(T)) return T();
const char *pData = value.data();
return *((T *)pData);
}
NimBLEAttValue readValue(time_t *timestamp = nullptr);
std::string toString();
NimBLERemoteService* getRemoteService();
uint8_t readUInt8() __attribute__ ((deprecated("Use template readValue<uint8_t>()")));
uint16_t readUInt16() __attribute__ ((deprecated("Use template readValue<uint16_t>()")));
uint32_t readUInt32() __attribute__ ((deprecated("Use template readValue<uint32_t>()")));
float readFloat() __attribute__ ((deprecated("Use template readValue<float>()")));
std::string getValue(time_t *timestamp = nullptr);
/**
* @brief A template to convert the remote characteristic data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
* less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>getValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
std::string value = getValue(timestamp);
if(!skipSizeCheck && value.size() < sizeof(T)) return T();
const char *pData = value.data();
return *((T *)pData);
}
NimBLEAttValue getValue(time_t *timestamp = nullptr);
bool subscribe(bool notifications = true,
notify_callback notifyCallback = nullptr,
@ -113,20 +82,74 @@ public:
bool writeValue(const uint8_t* data,
size_t length,
bool response = false);
bool writeValue(const std::string &newValue,
bool response = false);
bool writeValue(const std::vector<uint8_t>& v, bool response = false);
bool writeValue(const char* s, bool response = false);
/*********************** Template Functions ************************/
/**
* @brief Convenience template to set the remote characteristic value to <type\>val.
* @brief Template to set the remote characteristic value to <type\>val.
* @param [in] s The value to write.
* @param [in] response True == request write response.
* @details Only used for non-arrays and types without a `c_str()` method.
*/
template<typename T>
bool writeValue(const T &s, bool response = false) {
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<!std::is_array<T>::value && !Has_c_str_len<T>::value, bool>::type
#endif
writeValue(const T& s, bool response = false) {
return writeValue((uint8_t*)&s, sizeof(T), response);
}
std::string toString();
NimBLERemoteService* getRemoteService();
/**
* @brief Template to set the remote characteristic value to <type\>val.
* @param [in] s The value to write.
* @param [in] response True == request write response.
* @details Only used if the <type\> has a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<Has_c_str_len<T>::value, bool>::type
#endif
writeValue(const T& s, bool response = false) {
return writeValue((uint8_t*)s.c_str(), s.length(), response);
}
/**
* @brief Template to convert the remote characteristic data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
* less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>getValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T getValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
if(!skipSizeCheck && m_value.size() < sizeof(T)) return T();
return *((T *)m_value.getValue(timestamp));
}
/**
* @brief Template to convert the remote characteristic data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] timestamp A pointer to a time_t struct to store the time the value was read.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
* less than <tt>sizeof(<type\>)</tt>.
* @details <b>Use:</b> <tt>readValue<type>(&timestamp, skipSizeCheck);</tt>
*/
template<typename T>
T readValue(time_t *timestamp = nullptr, bool skipSizeCheck = false) {
NimBLEAttValue value = readValue();
if(!skipSizeCheck && value.size() < sizeof(T)) return T();
return *((T *)value.getValue(timestamp));
}
private:
@ -156,9 +179,8 @@ private:
uint16_t m_defHandle;
uint16_t m_endHandle;
NimBLERemoteService* m_pRemoteService;
std::string m_value;
NimBLEAttValue m_value;
notify_callback m_notifyCallback;
time_t m_timestamp;
// We maintain a vector of descriptors owned by this characteristic.
std::vector<NimBLERemoteDescriptor*> m_descriptorVector;

64
src/NimBLERemoteDescriptor.cpp
View file

@ -86,11 +86,7 @@ NimBLEUUID NimBLERemoteDescriptor::getUUID() {
* @deprecated Use readValue<uint8_t>().
*/
uint8_t NimBLERemoteDescriptor::readUInt8() {
std::string value = readValue();
if (value.length() >= 1) {
return (uint8_t) value[0];
}
return 0;
return readValue<uint8_t>();
} // readUInt8
@ -100,11 +96,7 @@ uint8_t NimBLERemoteDescriptor::readUInt8() {
* @deprecated Use readValue<uint16_t>().
*/
uint16_t NimBLERemoteDescriptor::readUInt16() {
std::string value = readValue();
if (value.length() >= 2) {
return *(uint16_t*) value.data();
}
return 0;
return readValue<uint16_t>();
} // readUInt16
@ -114,11 +106,7 @@ uint16_t NimBLERemoteDescriptor::readUInt16() {
* @deprecated Use readValue<uint32_t>().
*/
uint32_t NimBLERemoteDescriptor::readUInt32() {
std::string value = readValue();
if (value.length() >= 4) {
return *(uint32_t*) value.data();
}
return 0;
return readValue<uint32_t>();
} // readUInt32
@ -126,11 +114,11 @@ uint32_t NimBLERemoteDescriptor::readUInt32() {
* @brief Read the value of the remote descriptor.
* @return The value of the remote descriptor.
*/
std::string NimBLERemoteDescriptor::readValue() {
NimBLEAttValue NimBLERemoteDescriptor::readValue() {
NIMBLE_LOGD(LOG_TAG, ">> Descriptor readValue: %s", toString().c_str());
NimBLEClient* pClient = getRemoteCharacteristic()->getRemoteService()->getClient();
std::string value;
NimBLEAttValue value;
if (!pClient->isConnected()) {
NIMBLE_LOGE(LOG_TAG, "Disconnected");
@ -204,17 +192,17 @@ int NimBLERemoteDescriptor::onReadCB(uint16_t conn_handle,
NIMBLE_LOGD(LOG_TAG, "Read complete; status=%d conn_handle=%d", error->status, conn_handle);
std::string *strBuf = (std::string*)pTaskData->buf;
NimBLEAttValue *valBuf = (NimBLEAttValue*)pTaskData->buf;
int rc = error->status;
if(rc == 0) {
if(attr) {
uint16_t data_len = OS_MBUF_PKTLEN(attr->om);
if(((*strBuf).length() + data_len) > BLE_ATT_ATTR_MAX_LEN) {
if((valBuf->size() + data_len) > BLE_ATT_ATTR_MAX_LEN) {
rc = BLE_ATT_ERR_INVALID_ATTR_VALUE_LEN;
} else {
NIMBLE_LOGD(LOG_TAG, "Got %u bytes", data_len);
(*strBuf) += std::string((char*) attr->om->om_data, data_len);
valBuf->append(attr->om->om_data, data_len);
return 0;
}
}
@ -267,11 +255,33 @@ int NimBLERemoteDescriptor::onWriteCB(uint16_t conn_handle,
/**
* @brief Write data to the BLE Remote Descriptor.
* @brief Write a new value to a remote descriptor from a std::vector<uint8_t>.
* @param [in] vec A std::vector<uint8_t> value to write to the remote descriptor.
* @param [in] response Whether we require a response from the write.
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteDescriptor::writeValue(const std::vector<uint8_t>& vec, bool response) {
return writeValue((uint8_t*)&vec[0], vec.size(), response);
} // writeValue
/**
* @brief Write a new value to the remote descriptor from a const char*.
* @param [in] char_s A character string to write to the remote descriptor.
* @param [in] response Whether we require a response from the write.
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteDescriptor::writeValue(const char* char_s, bool response) {
return writeValue((uint8_t*)char_s, strlen(char_s), response);
} // writeValue
/**
* @brief Write a new value to a remote descriptor.
* @param [in] data The data to send to the remote descriptor.
* @param [in] length The length of the data to send.
* @param [in] response True if we expect a write response.
* @return True if successful
* @return false if not connected or otherwise cannot perform write.
*/
bool NimBLERemoteDescriptor::writeValue(const uint8_t* data, size_t length, bool response) {
@ -352,14 +362,4 @@ bool NimBLERemoteDescriptor::writeValue(const uint8_t* data, size_t length, bool
} // writeValue
/**
* @brief Write data represented as a string to the BLE Remote Descriptor.
* @param [in] newValue The data to send to the remote descriptor.
* @param [in] response True if we expect a response.
* @return True if successful
*/
bool NimBLERemoteDescriptor::writeValue(const std::string &newValue, bool response) {
return writeValue((uint8_t*) newValue.data(), newValue.length(), response);
} // writeValue
#endif /* CONFIG_BT_ENABLED && CONFIG_BT_NIMBLE_ROLE_CENTRAL */

69
src/NimBLERemoteDescriptor.h
View file

@ -29,10 +29,53 @@ public:
uint16_t getHandle();
NimBLERemoteCharacteristic* getRemoteCharacteristic();
NimBLEUUID getUUID();
std::string readValue();
NimBLEAttValue readValue();
uint8_t readUInt8() __attribute__ ((deprecated("Use template readValue<uint8_t>()")));
uint16_t readUInt16() __attribute__ ((deprecated("Use template readValue<uint16_t>()")));
uint32_t readUInt32() __attribute__ ((deprecated("Use template readValue<uint32_t>()")));
std::string toString(void);
bool writeValue(const uint8_t* data, size_t length, bool response = false);
bool writeValue(const std::vector<uint8_t>& v, bool response = false);
bool writeValue(const char* s, bool response = false);
/*********************** Template Functions ************************/
/**
* @brief A template to convert the remote descriptor data to <type\>.
* @brief Template to set the remote descriptor value to <type\>val.
* @param [in] s The value to write.
* @param [in] response True == request write response.
* @details Only used for non-arrays and types without a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<!std::is_array<T>::value && !Has_c_str_len<T>::value, bool>::type
#endif
writeValue(const T& s, bool response = false) {
return writeValue((uint8_t*)&s, sizeof(T), response);
}
/**
* @brief Template to set the remote descriptor value to <type\>val.
* @param [in] s The value to write.
* @param [in] response True == request write response.
* @details Only used if the <type\> has a `c_str()` method.
*/
template<typename T>
#ifdef _DOXYGEN_
bool
#else
typename std::enable_if<Has_c_str_len<T>::value, bool>::type
#endif
writeValue(const T& s, bool response = false) {
return writeValue((uint8_t*)s.c_str(), s.length(), response);
}
/**
* @brief Template to convert the remote descriptor data to <type\>.
* @tparam T The type to convert the data to.
* @param [in] skipSizeCheck If true it will skip checking if the data size is less than <tt>sizeof(<type\>)</tt>.
* @return The data converted to <type\> or NULL if skipSizeCheck is false and the data is
@ -41,27 +84,9 @@ public:
*/
template<typename T>
T readValue(bool skipSizeCheck = false) {
std::string value = readValue();
NimBLEAttValue value = readValue();
if(!skipSizeCheck && value.size() < sizeof(T)) return T();
const char *pData = value.data();
return *((T *)pData);
}
uint8_t readUInt8() __attribute__ ((deprecated("Use template readValue<uint8_t>()")));
uint16_t readUInt16() __attribute__ ((deprecated("Use template readValue<uint16_t>()")));
uint32_t readUInt32() __attribute__ ((deprecated("Use template readValue<uint32_t>()")));
std::string toString(void);
bool writeValue(const uint8_t* data, size_t length, bool response = false);
bool writeValue(const std::string &newValue, bool response = false);
/**
* @brief Convenience template to set the remote descriptor value to <type\>val.
* @param [in] s The value to write.
* @param [in] response True == request write response.
*/
template<typename T>
bool writeValue(const T &s, bool response = false) {
return writeValue((uint8_t*)&s, sizeof(T), response);
return *((T *)value.data());
}
private:

10
src/NimBLEService.cpp
View file

@ -250,10 +250,11 @@ uint16_t NimBLEService::getHandle() {
* @brief Create a new BLE Characteristic associated with this service.
* @param [in] uuid - The UUID of the characteristic.
* @param [in] properties - The properties of the characteristic.
* @param [in] max_len - The maximum length in bytes that the characteristic value can hold.
* @return The new BLE characteristic.
*/
NimBLECharacteristic* NimBLEService::createCharacteristic(const char* uuid, uint32_t properties) {
return createCharacteristic(NimBLEUUID(uuid), properties);
NimBLECharacteristic* NimBLEService::createCharacteristic(const char* uuid, uint32_t properties, uint16_t max_len) {
return createCharacteristic(NimBLEUUID(uuid), properties, max_len);
}
@ -261,10 +262,11 @@ NimBLECharacteristic* NimBLEService::createCharacteristic(const char* uuid, uint
* @brief Create a new BLE Characteristic associated with this service.
* @param [in] uuid - The UUID of the characteristic.
* @param [in] properties - The properties of the characteristic.
* @param [in] max_len - The maximum length in bytes that the characteristic value can hold.
* @return The new BLE characteristic.
*/
NimBLECharacteristic* NimBLEService::createCharacteristic(const NimBLEUUID &uuid, uint32_t properties) {
NimBLECharacteristic* pCharacteristic = new NimBLECharacteristic(uuid, properties, this);
NimBLECharacteristic* NimBLEService::createCharacteristic(const NimBLEUUID &uuid, uint32_t properties, uint16_t max_len) {
NimBLECharacteristic* pCharacteristic = new NimBLECharacteristic(uuid, properties, max_len, this);
if (getCharacteristic(uuid) != nullptr) {
NIMBLE_LOGD(LOG_TAG, "<< Adding a duplicate characteristic with UUID: %s",

6
src/NimBLEService.h
View file

@ -50,12 +50,14 @@ public:
NimBLECharacteristic* createCharacteristic(const char* uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE);
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
NimBLECharacteristic* createCharacteristic(const NimBLEUUID &uuid,
uint32_t properties =
NIMBLE_PROPERTY::READ |
NIMBLE_PROPERTY::WRITE);
NIMBLE_PROPERTY::WRITE,
uint16_t max_len = BLE_ATT_ATTR_MAX_LEN);
void addCharacteristic(NimBLECharacteristic* pCharacteristic);
void removeCharacteristic(NimBLECharacteristic* pCharacteristic, bool deleteChr = false);

2
src/NimBLEUtils.h
View file

@ -29,7 +29,7 @@ typedef struct {
void *pATT;
TaskHandle_t task;
int rc;
std::string *buf;
void *buf;
} ble_task_data_t;

23
src/nimconfig.h
View file

@ -25,6 +25,13 @@
#define CONFIG_BT_NIMBLE_ROLE_BROADCASTER
#endif
/* Enables the use of Arduino String class for attribute values */
#if defined __has_include
# if __has_include (<Arduino.h>)
# define NIMBLE_CPP_ARDUINO_STRING_AVAILABLE
# endif
#endif
#endif /* CONFIG_BT_ENABLED */
#ifdef _DOXYGEN_
@ -32,6 +39,22 @@
/** @brief Un-comment to change the number of simultaneous connections (esp controller max is 9) */
#define CONFIG_BT_NIMBLE_MAX_CONNECTIONS 3
/** @brief Un-comment to enable storing the timestamp when an attribute value is updated\n
* This allows for checking the last update time using getTimeStamp() or getValue(time_t*)\n
* If disabled, the timestamp returned from these functions will be 0.\n
* Disabling timestamps will reduce the memory used for each value.\n
* 1 = Enabled, 0 = Disabled; Default = Disabled
*/
#define CONFIG_NIMBLE_CPP_ATT_VALUE_TIMESTAMP_ENABLED 0
/** @brief Uncomment to set the default allocation size (bytes) for each attribute if\n
* not specified when the constructor is called. This is also the size used when a remote\n
* characteristic or descriptor is constructed before a value is read/notifed.\n
* Increasing this will reduce reallocations but increase memory footprint.\n
* Default value is 20. Range: 1 : 512 (BLE_ATT_ATTR_MAX_LEN)
*/
#define CONFIG_NIMBLE_CPP_ATT_VALUE_INIT_LENGTH 20
/** @brief Un-comment to change the default MTU size */
#define CONFIG_BT_NIMBLE_ATT_PREFERRED_MTU 255