Redbear BLE experiment

Code Analysis ( mbed )

• 1. initialise

  BLE ble;
  
  ...
  ble.init();
  

  Syntax: in BLE.h :

  137   class BLE {
  ...
  288     ble_error_t init(InitializationCompleteCallback_t completion_cb = NULL)
  289     {
  290         FunctionPointerWithContext callback(completion_cb);
  291         return initImplementation(callback);
  292     }
  ...
  1955    };

• 2. event handler

  ble.onDisconnection(disconnectionCallBack);

  disconnectionCallBack: 断开连接后开始广播,_t即type
  

  void disconnectionCallBack(const Gap::DisconnectionCallbackParams_t *params) {
      ble.startAdvertising();
  }

  Syntax: in BLE.h

   1577     MBED_DEPRECATED("ble.gap().onDisconnectionComplete(callback)")
   1578     void onDisconnection(Gap::DisconnectionEventCallback_t disconnectionCallback);

  Syntax: in Gap.h

   718     typedef FunctionPointerWithContext<const DisconnectionCallbackParams_t *>
   719         DisconnectionEventCallback_t;

  Syntax: in FunctionPointerWithContext.h

     55 template <typename ContextType>
     56 class FunctionPointerWithContext : public SafeBool<FunctionPointerWithContext<ContextType> > {
     57 public:
     58     typedef FunctionPointerWithContext<ContextType> *pFunctionPointerWithContext_t;
     59     typedef const FunctionPointerWithContext<ContextType> *cpFunctionPointerWithContext_t;
     60     typedef void (*pvoidfcontext_t)(ContextType context);

  Q: what is FunctionPointerWithContext, how to use typedef in C++?
  
  
  

  ble.onDataWritten(gattServerWriteCallBack);

  gattServerWriteCallBack:
  

  void gattServerWriteCallBack(const GattWriteCallbackParams *Handler) {
  	  uint8_t buf[TXRX_BUF_LEN];
  	  uint16_t bytesRead, index;
  
  	  if (Handler->handle == characteristic1.getValueAttribute().getHandle()) {
  		ble.readCharacteristicValue(characteristic1.getValueAttribute().getHandle(), buf, &bytesRead);
  		for(index=0; index<bytesRead; index++) {
  		  Serial.write(buf[index]);
  		}
  	  }
  	}