GAP_ConnWriteData() function

* Function GAP_ConnWriteData * Description Normally not GKI aware application will call this function * to send data to the connection. * Parameters: handle - Handle of the connection returned in the Open * p_data - Data area * max_len - Byte count requested * p_len - Byte count received * Returns BT_PASS - data read * GAP_ERR_BAD_HANDLE - invalid handle * GAP_ERR_BAD_STATE - connection not established * GAP_CONGESTION - system is congested