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Implement client long read / write

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Client will now read/write long characteristics and descriptors.
This commit is contained in:
h2zero 2020-05-07 19:47:41 -06:00
parent 04b524d1f8
commit 59823b4bf0
4 changed files with 158 additions and 104 deletions
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13
README.md
View file

@ -1,13 +1,10 @@
# *** UPDATE ***
Server now handles long reads and writes, still work to do on client.
NEW Client callback created - ```bool onConnParamsUpdateRequest(NimBLEClient* pClient, const ble_gap_upd_params* params)```
Called when the server wants to change the connection parameters, return true to accept them or false if not.
Check NimBLE_Client.ino example for a demonstration.
Client long read/write characteristics/descriptors now working.
We are now nearing 100% replacement of the original cpp_utils BLE library :smile:
# esp-nimble-cpp
A fork of the NimBLE stack restructured for compilation in the Ardruino IDE with a CPP library for use with ESP32.
NimBLE CPP library for use with ESP32 that attempts to maintain compatibility with the @nkolban cpp_uitls API.
Why? Because the Bluedroid library is too bulky.
@ -18,6 +15,8 @@ Initial client code testing has resulted in code size reduction of ~115k and red
Download as .zip and extract to components folder in your esp-idf project.
Run menuconfig, go to `Component config->Bluetooth->` enable Bluetooth and select NimBLE host.
`#include "NimBLEDevice.h"` in main.cpp.
@ -25,6 +24,8 @@ Download as .zip and extract to components folder in your esp-idf project.
This library is intended to be compatible with the original ESP32 BLE functions and types with minor changes.
Check [API_DIFFERENCES](https://github.com/h2zero/esp-nimble-cpp/blob/master/API_DIFFERENCES.md) for details.
# Acknowledgments:

121
src/NimBLERemoteCharacteristic.cpp
View file

@ -53,6 +53,8 @@ static const char* LOG_TAG = "NimBLERemoteCharacteristic";
m_charProp = chr->properties;
m_pRemoteService = pRemoteService;
m_notifyCallback = nullptr;
m_rawData = nullptr;
m_dataLen = 0;
} // NimBLERemoteCharacteristic
@ -61,7 +63,9 @@ static const char* LOG_TAG = "NimBLERemoteCharacteristic";
*/
NimBLERemoteCharacteristic::~NimBLERemoteCharacteristic() {
removeDescriptors(); // Release resources for any descriptor information we may have allocated.
if(m_rawData != nullptr) free(m_rawData);
if(m_rawData != nullptr) {
free(m_rawData);
}
} // ~NimBLERemoteCharacteristic
/*
@ -319,6 +323,8 @@ std::string NimBLERemoteCharacteristic::readValue() {
int rc = 0;
int retryCount = 1;
// Clear the value before reading.
m_value = "";
NimBLEClient* pClient = getRemoteService()->getClient();
@ -331,24 +337,27 @@ std::string NimBLERemoteCharacteristic::readValue() {
do {
m_semaphoreReadCharEvt.take("readValue");
rc = ble_gattc_read(pClient->getConnId(), m_handle,
NimBLERemoteCharacteristic::onReadCB, this);
// long read experiment
/* rc = ble_gattc_read_long(pClient->getConnId(), m_handle, 0,
NimBLERemoteCharacteristic::onReadCB, this);
*/
rc = ble_gattc_read_long(pClient->getConnId(), m_handle, 0,
NimBLERemoteCharacteristic::onReadCB,
this);
if (rc != 0) {
NIMBLE_LOGE(LOG_TAG, "Error: Failed to read characteristic; rc=%d", rc);
m_semaphoreReadCharEvt.give();
NIMBLE_LOGE(LOG_TAG, "Error: Failed to read characteristic; rc=%d, %s",
rc, NimBLEUtils::returnCodeToString(rc));
m_semaphoreReadCharEvt.give(0);
return "";
}
rc = m_semaphoreReadCharEvt.wait("readValue");
switch(rc){
case 0:
case BLE_HS_EDONE:
rc = 0;
break;
// Characteristic is not long-readable, return with what we have.
case BLE_HS_ATT_ERR(BLE_ATT_ERR_ATTR_NOT_LONG):
NIMBLE_LOGI(LOG_TAG, "Attribute not long");
rc = 0;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHEN):
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHOR):
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_ENC):
@ -361,7 +370,7 @@ std::string NimBLERemoteCharacteristic::readValue() {
} while(rc != 0 && retryCount--);
NIMBLE_LOGD(LOG_TAG, "<< readValue(): length: %d", m_value.length());
return (rc == 0) ? m_value : "";
return m_value;
} // readValue
@ -374,36 +383,25 @@ int NimBLERemoteCharacteristic::onReadCB(uint16_t conn_handle,
struct ble_gatt_attr *attr, void *arg)
{
NimBLERemoteCharacteristic* characteristic = (NimBLERemoteCharacteristic*)arg;
uint16_t conn_id = characteristic->getRemoteService()->getClient()->getConnId();
// Make sure the discovery is for this device
if(characteristic->getRemoteService()->getClient()->getConnId() != conn_handle){
// Make sure the read is for this client
if(conn_id != conn_handle) {
return 0;
}
NIMBLE_LOGI(LOG_TAG, "Read complete; status=%d conn_handle=%d", error->status, conn_handle);
// long read experiment
/* if(attr && (attr->om->om_len >= (ble_att_mtu(characteristic->getRemoteService()->getClient()->getConnId()) - 1))){
return 0;
}
*/
if(characteristic->m_rawData != nullptr) {
free(characteristic->m_rawData);
}
if(error->status == 0) {
characteristic->m_value = std::string((char*) attr->om->om_data, attr->om->om_len);
characteristic->m_rawData = (uint8_t*) calloc(attr->om->om_len, sizeof(uint8_t));
memcpy(characteristic->m_rawData, attr->om->om_data, attr->om->om_len);
characteristic->m_semaphoreReadCharEvt.give(0);
} else {
characteristic->m_rawData = nullptr;
characteristic->m_value = "";
characteristic->m_semaphoreReadCharEvt.give(error->status);
}
if(attr) {
NIMBLE_LOGD(LOG_TAG, "Got %d bytes", attr->om->om_len);
// characteristic->m_semaphoreReadCharEvt.give(error->status);
return 0; //1
characteristic->m_value += std::string((char*) attr->om->om_data, attr->om->om_len);
return 0;
}
}
// Read complete release semaphore and let the app can continue.
characteristic->m_semaphoreReadCharEvt.give(error->status);
return 0;
}
@ -523,7 +521,7 @@ bool NimBLERemoteCharacteristic::writeValue(uint8_t* data, size_t length, bool r
NimBLEClient* pClient = getRemoteService()->getClient();
int rc = 0;
int retryCount = 1;
// uint16_t mtu;
uint16_t mtu;
// Check to see that we are connected.
if (!pClient->isConnected()) {
@ -531,29 +529,30 @@ bool NimBLERemoteCharacteristic::writeValue(uint8_t* data, size_t length, bool r
return false;
}
// mtu = ble_att_mtu(pClient->getConnId()) - 3;
mtu = ble_att_mtu(pClient->getConnId()) - 3;
if(/*!length > mtu &&*/ !response) {
// Check if the data length is longer than we can write in 1 connection event.
// If so we must do a long write which requires a response.
if(length <= mtu && !response) {
rc = ble_gattc_write_no_rsp_flat(pClient->getConnId(), m_handle, data, length);
return (rc==0);
}
do {
m_semaphoreWriteCharEvt.take("writeValue");
// long write experiment
/* if(length > mtu) {
NIMBLE_LOGD(LOG_TAG,"long write");
if(length > mtu) {
NIMBLE_LOGI(LOG_TAG,"long write %d bytes", length);
os_mbuf *om = ble_hs_mbuf_from_flat(data, length);
rc = ble_gattc_write_long(pClient->getConnId(), m_handle, 0, om,
NimBLERemoteCharacteristic::onWriteCB,
this);
} else {
*/
rc = ble_gattc_write_flat(pClient->getConnId(), m_handle,
data, length,
NimBLERemoteCharacteristic::onWriteCB,
this);
// }
}
if (rc != 0) {
NIMBLE_LOGE(LOG_TAG, "Error: Failed to write characteristic; rc=%d", rc);
m_semaphoreWriteCharEvt.give();
@ -564,6 +563,13 @@ bool NimBLERemoteCharacteristic::writeValue(uint8_t* data, size_t length, bool r
switch(rc){
case 0:
case BLE_HS_EDONE:
rc = 0;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_ATTR_NOT_LONG):
NIMBLE_LOGE(LOG_TAG, "Long write not supported by peer; Truncating length to %d", mtu);
retryCount++;
length = mtu;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHEN):
@ -599,13 +605,7 @@ int NimBLERemoteCharacteristic::onWriteCB(uint16_t conn_handle,
NIMBLE_LOGI(LOG_TAG, "Write complete; status=%d conn_handle=%d", error->status, conn_handle);
if (error->status == 0) {
characteristic->m_semaphoreWriteCharEvt.give(0);
} else {
characteristic->m_semaphoreWriteCharEvt.give(error->status);
}
return 0;
}
@ -613,13 +613,34 @@ int NimBLERemoteCharacteristic::onWriteCB(uint16_t conn_handle,
/**
* @brief Read raw data from remote characteristic as hex bytes
* @return return pointer data read
* @return uint8_t pointer to the data read.
*/
uint8_t* NimBLERemoteCharacteristic::readRawData() {
if(m_rawData != nullptr) {
free(m_rawData);
m_rawData = nullptr;
}
m_dataLen = m_value.length();
// If we have data copy it to rawData
if(m_dataLen) {
m_rawData = (uint8_t*) calloc(m_dataLen, sizeof(uint8_t));
memcpy(m_rawData, m_value.data(), m_dataLen);
}
return m_rawData;
}
/**
* @brief Get the length of the data read from the remote characteristic.
* @return size_t length of the data in bytes.
*/
size_t NimBLERemoteCharacteristic::getDataLength() {
return m_value.length();
}
void NimBLERemoteCharacteristic::releaseSemaphores() {
for (auto &dPair : m_descriptorMap) {
dPair.second->releaseSemaphores();

4
src/NimBLERemoteCharacteristic.h
View file

@ -60,6 +60,7 @@ public:
bool writeValue(uint8_t newValue, bool response = false);
std::string toString();
uint8_t* readRawData();
size_t getDataLength();
NimBLERemoteService* getRemoteService();
private:
@ -90,7 +91,8 @@ private:
FreeRTOS::Semaphore m_semaphoreReadCharEvt = FreeRTOS::Semaphore("ReadCharEvt");
FreeRTOS::Semaphore m_semaphoreWriteCharEvt = FreeRTOS::Semaphore("WriteCharEvt");
std::string m_value;
uint8_t* m_rawData = nullptr;
uint8_t* m_rawData;
size_t m_dataLen;
notify_callback m_notifyCallback;
// We maintain a map of descriptors owned by this characteristic keyed by a string representation of the UUID.

76
src/NimBLERemoteDescriptor.cpp
View file

@ -15,6 +15,7 @@
#if defined(CONFIG_BT_ENABLED)
#include "NimBLERemoteDescriptor.h"
#include "NimBLEUtils.h"
#include "NimBLELog.h"
static const char* LOG_TAG = "NimBLERemoteDescriptor";
@ -83,22 +84,26 @@ int NimBLERemoteDescriptor::onReadCB(uint16_t conn_handle,
struct ble_gatt_attr *attr, void *arg)
{
NimBLERemoteDescriptor* desc = (NimBLERemoteDescriptor*)arg;
uint16_t conn_id = desc->getRemoteCharacteristic()->getRemoteService()->getClient()->getConnId();
// Make sure the discovery is for this device
if(desc->getRemoteCharacteristic()->getRemoteService()->getClient()->getConnId() != conn_handle){
if(conn_id != conn_handle){
return 0;
}
NIMBLE_LOGD(LOG_TAG, "Read complete; status=%d conn_handle=%d", error->status, conn_handle);
if(error->status == 0){
desc->m_value = std::string((char*) attr->om->om_data, attr->om->om_len);
desc->m_semaphoreReadDescrEvt.give(0);
} else {
desc->m_value = "";
desc->m_semaphoreReadDescrEvt.give(error->status);
if(attr){
NIMBLE_LOGD(LOG_TAG, "Got %d bytes", attr->om->om_len);
desc->m_value += std::string((char*) attr->om->om_data, attr->om->om_len);
return 0;
}
}
// Read complete release semaphore and let the app can continue.
desc->m_semaphoreReadDescrEvt.give(error->status);
return 0;
}
@ -106,10 +111,12 @@ int NimBLERemoteDescriptor::onReadCB(uint16_t conn_handle,
std::string NimBLERemoteDescriptor::readValue() {
NIMBLE_LOGD(LOG_TAG, ">> Descriptor readValue: %s", toString().c_str());
NimBLEClient* pClient = getRemoteCharacteristic()->getRemoteService()->getClient();
int rc = 0;
int retryCount = 1;
// Clear the value before reading.
m_value = "";
NimBLEClient* pClient = getRemoteCharacteristic()->getRemoteService()->getClient();
// Check to see that we are connected.
if (!pClient->isConnected()) {
@ -120,12 +127,13 @@ std::string NimBLERemoteDescriptor::readValue() {
do {
m_semaphoreReadDescrEvt.take("ReadDescriptor");
rc = ble_gattc_read(pClient->getConnId(), m_handle,
NimBLERemoteDescriptor::onReadCB, this);
rc = ble_gattc_read_long(pClient->getConnId(), m_handle, 0,
NimBLERemoteDescriptor::onReadCB,
this);
if (rc != 0) {
NIMBLE_LOGE(LOG_TAG, "Descriptor read failed, code: %d", rc);
m_semaphoreReadDescrEvt.give();
NIMBLE_LOGE(LOG_TAG, "Error: Failed to read descriptor; rc=%d, %s",
rc, NimBLEUtils::returnCodeToString(rc));
m_semaphoreReadDescrEvt.give(0);
return "";
}
@ -133,8 +141,14 @@ std::string NimBLERemoteDescriptor::readValue() {
switch(rc){
case 0:
case BLE_HS_EDONE:
rc = 0;
break;
// Descriptor is not long-readable, return with what we have.
case BLE_HS_ATT_ERR(BLE_ATT_ERR_ATTR_NOT_LONG):
NIMBLE_LOGI(LOG_TAG, "Attribute not long");
rc = 0;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHEN):
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHOR):
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_ENC):
@ -146,9 +160,8 @@ std::string NimBLERemoteDescriptor::readValue() {
}
} while(rc != 0 && retryCount--);
NIMBLE_LOGD(LOG_TAG, "<< Descriptor readValue(): length: %d, rc: %d", m_value.length(), rc);
return (rc == 0) ? m_value : "";
NIMBLE_LOGD(LOG_TAG, "<< Descriptor readValue(): length: %d", m_value.length());
return m_value;
} // readValue
@ -211,11 +224,7 @@ int NimBLERemoteDescriptor::onWriteCB(uint16_t conn_handle,
NIMBLE_LOGD(LOG_TAG, "Write complete; status=%d conn_handle=%d", error->status, conn_handle);
if (error->status == 0) {
descriptor->m_semaphoreDescWrite.give(0);
} else {
descriptor->m_semaphoreDescWrite.give(error->status);
}
return 0;
}
@ -235,6 +244,7 @@ bool NimBLERemoteDescriptor::writeValue(uint8_t* data, size_t length, bool respo
int rc = 0;
int retryCount = 1;
uint16_t mtu;
// Check to see that we are connected.
if (!pClient->isConnected()) {
@ -242,7 +252,11 @@ bool NimBLERemoteDescriptor::writeValue(uint8_t* data, size_t length, bool respo
return false;
}
if(!response) {
mtu = ble_att_mtu(pClient->getConnId()) - 3;
// Check if the data length is longer than we can write in 1 connection event.
// If so we must do a long write which requires a response.
if(length <= mtu && !response) {
rc = ble_gattc_write_no_rsp_flat(pClient->getConnId(), m_handle, data, length);
return (rc == 0);
}
@ -250,10 +264,19 @@ bool NimBLERemoteDescriptor::writeValue(uint8_t* data, size_t length, bool respo
do {
m_semaphoreDescWrite.take("WriteDescriptor");
if(length > mtu) {
NIMBLE_LOGI(LOG_TAG,"long write %d bytes", length);
os_mbuf *om = ble_hs_mbuf_from_flat(data, length);
rc = ble_gattc_write_long(pClient->getConnId(), m_handle, 0, om,
NimBLERemoteDescriptor::onWriteCB,
this);
} else {
rc = ble_gattc_write_flat(pClient->getConnId(), m_handle,
data, length,
NimBLERemoteDescriptor::onWriteCB,
this);
}
if (rc != 0) {
NIMBLE_LOGE(LOG_TAG, "Error: Failed to write descriptor; rc=%d", rc);
m_semaphoreDescWrite.give();
@ -264,6 +287,13 @@ bool NimBLERemoteDescriptor::writeValue(uint8_t* data, size_t length, bool respo
switch(rc){
case 0:
case BLE_HS_EDONE:
rc = 0;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_ATTR_NOT_LONG):
NIMBLE_LOGE(LOG_TAG, "Long write not supported by peer; Truncating length to %d", mtu);
retryCount++;
length = mtu;
break;
case BLE_HS_ATT_ERR(BLE_ATT_ERR_INSUFFICIENT_AUTHEN):
@ -278,7 +308,7 @@ bool NimBLERemoteDescriptor::writeValue(uint8_t* data, size_t length, bool respo
} while(rc != 0 && retryCount--);
NIMBLE_LOGD(LOG_TAG, "<< Descriptor writeValue, rc: %d",rc);
return (rc == 0); //true;
return (rc == 0);
} // writeValue