[Server] Add ability to create static attributes.

This allows creating instances of services/characteristics and decriptors without
needing to call the parent createX() methods. This allows creation of the attibutes
within a class or other structure and the attributes can be linked to the parent by
calling the parent addX() method.

Additonally this increases the backward compatibility with the original bluedroid library
to further support user migration.

src/NimBLE2904.h

@@ -42,6 +42,7 @@ struct BLE2904_Data {
  */
 class NimBLE2904: public NimBLEDescriptor {
 public:
+    NimBLE2904(NimBLECharacteristic* pCharacterisitic = nullptr);
     static const uint8_t FORMAT_BOOLEAN   = 1;
     static const uint8_t FORMAT_UINT2     = 2;
     static const uint8_t FORMAT_UINT4     = 3;
@@ -77,7 +78,6 @@ public:
     void setUnit(uint16_t unit);
 
 private:
-    NimBLE2904(NimBLECharacteristic* pCharacterisitic);
     friend class NimBLECharacteristic;
     BLE2904_Data m_data;
 }; // BLE2904

src/NimBLECharacteristic.cpp

@@ -94,9 +94,20 @@ NimBLEDescriptor* NimBLECharacteristic::createDescriptor(const NimBLEUUID &uuid,
         pDescriptor = new NimBLEDescriptor(uuid, properties, max_len, this);
     }
 
-    m_dscVec.push_back(pDescriptor);
+    addDescriptor(pDescriptor);
+
     return pDescriptor;
-} // createCharacteristic
+} // createDescriptor
+
+
+/**
+ * @brief Add a descriptor to the characteristic.
+ * @param [in] A pointer to the descriptor to add.
+ */
+void NimBLECharacteristic::addDescriptor(NimBLEDescriptor *pDescriptor) {
+    pDescriptor->setCharacteristic(this);
+    m_dscVec.push_back(pDescriptor);
+}
 
 
 /**
@@ -164,6 +175,11 @@ NimBLEService* NimBLECharacteristic::getService() {
 } // getService
 
 
+void NimBLECharacteristic::setService(NimBLEService *pService) {
+    m_pService = pService;
+}
+
+
 /**
  * @brief Get the UUID of the characteristic.
  * @return The UUID of the characteristic.

src/NimBLECharacteristic.h

@@ -59,6 +59,18 @@ class NimBLECharacteristicCallbacks;
  */
 class NimBLECharacteristic {
 public:
+    NimBLECharacteristic(const char* uuid,
+                         uint16_t properties =
+                         NIMBLE_PROPERTY::READ |
+                         NIMBLE_PROPERTY::WRITE,
+                         NimBLEService* pService = nullptr);
+    NimBLECharacteristic(const NimBLEUUID &uuid,
+                         uint16_t properties =
+                         NIMBLE_PROPERTY::READ |
+                         NIMBLE_PROPERTY::WRITE,
+                         NimBLEService* pService = nullptr);
+
+    ~NimBLECharacteristic();
 
     uint16_t          getHandle();
     NimBLEUUID        getUUID();
@@ -83,6 +95,7 @@ public:
                                        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);
@@ -117,30 +130,15 @@ public:
         setValue((uint8_t*)&s, sizeof(T));
     }
 
-
+    NimBLEService*    getService();
-
+    uint16_t          getProperties();
-
 
 private:
 
     friend class    NimBLEServer;
     friend class    NimBLEService;
 
-    NimBLECharacteristic(const char* uuid,
+    void            setService(NimBLEService *pService);
-                         uint16_t properties =
-                         NIMBLE_PROPERTY::READ |
-                         NIMBLE_PROPERTY::WRITE,
-                         NimBLEService* pService = nullptr);
-    NimBLECharacteristic(const NimBLEUUID &uuid,
-                         uint16_t properties =
-                         NIMBLE_PROPERTY::READ |
-                         NIMBLE_PROPERTY::WRITE,
-                         NimBLEService* pService = nullptr);
-
-    ~NimBLECharacteristic();
-
-    NimBLEService*  getService();
-    uint16_t        getProperties();
     void            setSubscribe(struct ble_gap_event *event);
     static int      handleGapEvent(uint16_t conn_handle, uint16_t attr_handle,
                                    struct ble_gatt_access_ctxt *ctxt, void *arg);

src/NimBLEDescriptor.cpp

@@ -37,6 +37,7 @@ NimBLEDescriptor::NimBLEDescriptor(const char* uuid, uint16_t properties, uint16
 : NimBLEDescriptor(NimBLEUUID(uuid), max_len, properties, pCharacteristic) {
 }
 
+
 /**
  * @brief NimBLEDescriptor constructor.
  */
@@ -47,7 +48,7 @@ NimBLEDescriptor::NimBLEDescriptor(NimBLEUUID uuid, uint16_t properties, uint16_
     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    = nullptr;                     // No initial characteristic.
+    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_valMux             = portMUX_INITIALIZER_UNLOCKED;
@@ -122,6 +123,7 @@ uint8_t* NimBLEDescriptor::getValue() {
     return m_value.attr_value;
 } // getValue
 
+
 /**
  * @brief Get the value of this descriptor as a string.
  * @return A std::string instance containing a copy of the descriptor's value.
@@ -130,9 +132,18 @@ std::string NimBLEDescriptor::getStringValue() {
     return std::string((char *) m_value.attr_value, m_value.attr_len);
 }
 
+
+/**
+ * @brief Get the characteristic this descriptor belongs to.
+ * @return A pointer to the characteristic this descriptor belongs to.
+ */
+NimBLECharacteristic* NimBLEDescriptor::getCharacteristic() {
+    return m_pCharacteristic;
+} // getCharacteristic
+
+
 int NimBLEDescriptor::handleGapEvent(uint16_t conn_handle, uint16_t attr_handle,
-                             struct ble_gatt_access_ctxt *ctxt,
+                                     struct ble_gatt_access_ctxt *ctxt, void *arg) {
-                                     void *arg) {
     const ble_uuid_t *uuid;
     int rc;
     NimBLEDescriptor* pDescriptor = (NimBLEDescriptor*)arg;
@@ -237,6 +248,14 @@ void NimBLEDescriptor::setValue(const std::string &value) {
     setValue((uint8_t*) value.data(), value.length());
 } // setValue
 
+/**
+ * @brief Set the characteristic this descriptor belongs to.
+ * @param [in] pChar A pointer to the characteristic this descriptior belongs to.
+ */
+void NimBLEDescriptor::setCharacteristic(NimBLECharacteristic* pChar) {
+    m_pCharacteristic = pChar;
+} // setCharacteristic
+
 
 /**
  * @brief Return a string representation of the descriptor.

src/NimBLEDescriptor.h

@@ -43,6 +43,16 @@ class NimBLEDescriptorCallbacks;
  */
 class NimBLEDescriptor {
 public:
+    NimBLEDescriptor(const char* uuid, uint16_t properties,
+                     uint16_t max_len,
+                     NimBLECharacteristic* pCharacteristic = nullptr);
+
+    NimBLEDescriptor(NimBLEUUID uuid, uint16_t properties,
+                     uint16_t max_len,
+                     NimBLECharacteristic* pCharacteristic = nullptr);
+
+    ~NimBLEDescriptor();
+
     uint16_t              getHandle();
     NimBLEUUID            getUUID();
     std::string           toString();
@@ -55,6 +65,8 @@ public:
 
     void                  setValue(const uint8_t* data, size_t size);
     void                  setValue(const std::string &value);
+    NimBLECharacteristic* getCharacteristic();
+
     /**
      * @brief Convenience template to set the descriptor value to <type\>val.
      * @param [in] s The value to set.
@@ -67,22 +79,12 @@ public:
 private:
     friend class NimBLECharacteristic;
     friend class NimBLEService;
-    friend class NimBLE2902;
     friend class NimBLE2904;
 
-    NimBLEDescriptor(const char* uuid, uint16_t properties,
-                     uint16_t max_len,
-                     NimBLECharacteristic* pCharacteristic);
-
-    NimBLEDescriptor(NimBLEUUID uuid, uint16_t properties,
-                     uint16_t max_len,
-                     NimBLECharacteristic* pCharacteristic);
-
-    ~NimBLEDescriptor();
-
     static int handleGapEvent(uint16_t conn_handle, uint16_t attr_handle,
                               struct ble_gatt_access_ctxt *ctxt, void *arg);
     void       setHandle(uint16_t handle);
+    void       setCharacteristic(NimBLECharacteristic* pChar);
 
     NimBLEUUID                 m_uuid;
     uint16_t                   m_handle;

src/NimBLEServer.cpp

@@ -650,14 +650,23 @@ void NimBLEServer::removeService(NimBLEService* service, bool deleteSvc) {
 
 
 /**
- * @brief Adds a service which was already created, but removed from availability.
+ * @brief Adds a service which was either already created but removed from availability,\n
+ * or created and later added to services list.
  * @param [in] service The service object to add.
  * @note If it is desired to advertise the service it must be added by
  * calling NimBLEAdvertising::addServiceUUID.
  */
 void NimBLEServer::addService(NimBLEService* service) {
-    // If adding a service that was not removed just return.
+    // Check that a service with the supplied UUID does not already exist.
+    if(getServiceByUUID(service->getUUID()) != nullptr) {
+        NIMBLE_LOGW(LOG_TAG, "Warning creating a duplicate service UUID: %s",
+                             std::string(service->getUUID()).c_str());
+    }
+
+    // If adding a service that was not removed add it and return.
+    // Else reset GATT and send service changed notification.
     if(service->m_removed == 0) {
+        m_svcVec.push_back(service);
         return;
     }
 

src/NimBLEService.cpp

@@ -246,6 +246,11 @@ NimBLECharacteristic* NimBLEService::createCharacteristic(const NimBLEUUID &uuid
 } // createCharacteristic
 
 
+void NimBLEService::addCharacteristic(NimBLECharacteristic* pCharacteristic) {
+    pCharacteristic->setService(this);
+    m_chrVec.push_back(pCharacteristic);
+}
+
 /**
  * @brief Get a pointer to the characteristic object with the specified UUID.
  * @param [in] uuid The UUID of the characteristic.

src/NimBLEService.h

@@ -36,6 +36,10 @@ class NimBLECharacteristic;
 class NimBLEService {
 public:
 
+    NimBLEService(const char* uuid, uint16_t numHandles, NimBLEServer* pServer);
+    NimBLEService(const NimBLEUUID &uuid, uint16_t numHandles, NimBLEServer* pServer);
+    ~NimBLEService();
+
     NimBLEServer*         getServer();
 
     NimBLEUUID            getUUID();
@@ -55,6 +59,7 @@ public:
                                                NIMBLE_PROPERTY::READ |
                                                NIMBLE_PROPERTY::WRITE);
 
+    void                  addCharacteristic(NimBLECharacteristic* pCharacteristic);
     NimBLECharacteristic* getCharacteristic(const char* uuid, uint16_t instanceId = 0);
     NimBLECharacteristic* getCharacteristic(const NimBLEUUID &uuid, uint16_t instanceId = 0);
     NimBLECharacteristic* getCharacteristicByHandle(uint16_t handle);
@@ -65,9 +70,6 @@ public:
 
 
 private:
-    NimBLEService(const char* uuid, uint16_t numHandles, NimBLEServer* pServer);
-    NimBLEService(const NimBLEUUID &uuid, uint16_t numHandles, NimBLEServer* pServer);
-    ~NimBLEService();
 
     friend class          NimBLEServer;
     friend class          NimBLEDevice;