Diff: source/BlueNRGGattClient.cpp

Revision:

0:88b85febcb45

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/source/BlueNRGGattClient.cpp	Sun Jun 18 16:10:28 2017 +0000
@@ -0,0 +1,835 @@
+/* mbed Microcontroller Library
+* Copyright (c) 2006-2013 ARM Limited
+*
+* Licensed under the Apache License, Version 2.0 (the "License");
+* you may not use this file except in compliance with the License.
+* You may obtain a copy of the License at
+*
+*     http://www.apache.org/licenses/LICENSE-2.0
+*
+* Unless required by applicable law or agreed to in writing, software
+* distributed under the License is distributed on an "AS IS" BASIS,
+* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+* See the License for the specific language governing permissions and
+* limitations under the License.
+*/
+/**
+  ******************************************************************************
+  * @file    BlueNRGGattServer.cpp
+  * @author  STMicroelectronics
+  * @brief   Implementation of BlueNRG BLE_API GattServer Class
+  ******************************************************************************
+  * @copy
+  *
+  * THE PRESENT FIRMWARE WHICH IS FOR GUIDANCE ONLY AIMS AT PROVIDING CUSTOMERS
+  * WITH CODING INFORMATION REGARDING THEIR PRODUCTS IN ORDER FOR THEM TO SAVE
+  * TIME. AS A RESULT, STMICROELECTRONICS SHALL NOT BE HELD LIABLE FOR ANY
+  * DIRECT, INDIRECT OR CONSEQUENTIAL DAMAGES WITH RESPECT TO ANY CLAIMS ARISING
+  * FROM THE CONTENT OF SUCH FIRMWARE AND/OR THE USE MADE BY CUSTOMERS OF THE
+  * CODING INFORMATION CONTAINED HEREIN IN CONNECTION WITH THEIR PRODUCTS.
+  *
+  * <h2><center>&copy; COPYRIGHT 2013 STMicroelectronics</center></h2>
+  */
+
+/** @defgroup BlueNRGGATTClient
+ *  @brief BlueNRG BLE_API GattClient Adaptation
+ *  @{
+ */
+
+#include "BlueNRGGattClient.h"
+#ifdef YOTTA_CFG_MBED_OS
+    #include "mbed-drivers/mbed.h"
+#else
+    #include "mbed.h"
+#endif 
+#include "BlueNRGGap.h"
+#include "ble_utils.h"
+#include "ble_debug.h"
+
+static uint8_t props_mask[] = {
+  0x01,
+  0x02,
+  0x04,
+  0x08,
+  0x10,
+  0x20,
+  0x40,
+  0x80
+  };
+
+void BlueNRGGattClient::gattProcedureCompleteCB(Gap::Handle_t connectionHandle, uint8_t error_code)
+{
+  if(error_code != BLE_STATUS_SUCCESS) {
+    _currentState = GATT_IDLE;
+    return;
+  }
+
+  // Service Discovery complete
+/*
+  if(_currentState != GATT_IDLE &&
+     _currentState != GATT_DISCOVERY_TERMINATED &&
+     _currentState != GATT_WRITE_CHAR &&
+     _currentState != GATT_READ_CHAR) {
+*/
+  if(_currentState == GATT_SERVICE_DISCOVERY) {
+    findServiceChars(connectionHandle);
+  }
+
+  if(_currentState == GATT_CHAR_DESC_DISCOVERY) {
+      if(charDescTerminationCallback != NULL) {
+         CharacteristicDescriptorDiscovery::TerminationCallbackParams_t params = {
+                                   _characteristic,
+                                   BLE_ERROR_NONE
+         };
+         charDescTerminationCallback(&params);
+       }
+    _currentState = GATT_IDLE;
+  }
+
+  // Read complete
+  if(_currentState == GATT_READ_CHAR) {
+    _currentState = GATT_IDLE;
+  }
+
+  // Write complete
+  if(_currentState == GATT_WRITE_CHAR) {
+    BlueNRGGattClient::getInstance().processWriteResponse(&writeCBParams);
+    _currentState = GATT_IDLE;
+  }
+}
+
+void BlueNRGGattClient::primaryServicesCB(Gap::Handle_t connectionHandle,
+                                          uint8_t event_data_length,
+                                          uint8_t attribute_data_length,
+                                          uint8_t *attribute_data_list)
+{
+  GattAttribute::Handle_t startHandle, endHandle;
+  UUID uuid;
+  uint8_t i, offset, numAttr;
+  /* avoid compiler warnings about unused variables */
+  (void)connectionHandle;
+
+  numAttr = (event_data_length - 1) / attribute_data_length;
+
+  offset = 0;
+  for (i=0; i<numAttr; i++) {
+    startHandle = attribute_data_list[offset];
+    endHandle = attribute_data_list[offset+2];
+
+    // UUID Type
+    if (attribute_data_length == 6) {
+
+      PRINTF("UUID_TYPE_16\n\r");
+      uuid = attribute_data_list[offset+5]<<8|attribute_data_list[offset+4];
+      PRINTF("S UUID-%X attrs[%u %u]\r\n", uuid.getShortUUID(), startHandle, endHandle);
+
+    } else {
+
+      PRINTF("UUID_TYPE_128\n\r");
+      uuid.setupLong(attribute_data_list+offset+4, UUID::LSB);
+
+#ifdef DEBUG
+      PRINTF("S UUID-");
+      const uint8_t *longUUIDBytes = uuid.getBaseUUID();
+      for (unsigned j = 0; j < UUID::LENGTH_OF_LONG_UUID; j++) {
+        PRINTF("%02x", longUUIDBytes[j]);
+      }
+#endif
+      PRINTF(" attrs[%u %u]\r\n", startHandle, endHandle);
+
+    }
+
+    PRINTF("Setup serviceIndex = %d\n\r", _numServices);
+    discoveredService[_numServices].setup(uuid, startHandle, endHandle);
+
+    _numServices++;
+
+    offset += attribute_data_length;
+  }
+
+  PRINTF("!!!Service Discovery complete (numAttr=%u)!!!\n\r", numAttr);
+
+}
+
+void BlueNRGGattClient::primaryServiceCB(Gap::Handle_t connectionHandle,
+                                         uint8_t event_data_length,
+                                         uint8_t *handles_info_list)
+{
+  GattAttribute::Handle_t startHandle, endHandle;
+  UUID uuid;
+  uint8_t i, offset, numHandlePairs;
+  /* avoid compiler warnings about unused variables */
+  (void)connectionHandle;
+
+  numHandlePairs = (event_data_length - 1) / 2;
+
+  offset = 0;
+  for (i=0; i<numHandlePairs; i++) {
+    startHandle = handles_info_list[offset];
+    endHandle = handles_info_list[offset+2];
+
+    PRINTF("primaryServiceCB attrs[%u %u]\r\n", startHandle, endHandle);
+
+
+    if (_matchingServiceUUID.shortOrLong() == UUID::UUID_TYPE_SHORT) {
+        PRINTF("S UUID-%x attrs[%u %u]\r\n", _matchingServiceUUID.getShortUUID(), startHandle, endHandle);
+        uuid = _matchingServiceUUID.getShortUUID();
+    } else {
+#ifdef DEBUG
+        PRINTF("S UUID-");
+        const uint8_t *longUUIDBytes = _matchingServiceUUID.getBaseUUID();
+        for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+            PRINTF("%02x", longUUIDBytes[i]);
+        }
+#endif
+        PRINTF(" attrs[%u %u]\r\n", startHandle, endHandle);
+        uuid.setupLong(_matchingServiceUUID.getBaseUUID(), UUID::MSB);
+    }
+
+    discoveredService[i].setup(uuid, startHandle, endHandle);
+
+    _numServices++;
+
+    offset += 4;
+  }
+}
+
+void BlueNRGGattClient::serviceCharsCB(Gap::Handle_t connectionHandle,
+                                       uint8_t event_data_length,
+                                       uint8_t handle_value_pair_length,
+                                       uint8_t *handle_value_pair)
+{
+  // Charac Handle (2), Charac Properties(1), Charac Value Handle(2), Charac UUID(2/16)
+
+  GattAttribute::Handle_t declHandle, valueHandle, lastHandle;
+  UUID uuid;
+  uint8_t i, numChar, offset;
+
+  numChar = (event_data_length - 1) / handle_value_pair_length;
+
+  PRINTF("event_data_length=%d handle_value_pair_length=%d numChar=%d\n\r", event_data_length, handle_value_pair_length, numChar);
+
+  offset = 0;
+  for (i=0; i<numChar; i++) {
+    // UUID Type
+    if (handle_value_pair_length == 7) {
+      PRINTF("Char UUID_TYPE_16\n\r");
+      uuid = handle_value_pair[offset+6]<<8|handle_value_pair[offset+5];
+      PRINTF("C UUID-%X\r\n", uuid.getShortUUID());
+    } else {
+      PRINTF("Char UUID_TYPE_128\n\r");
+      uuid.setupLong(handle_value_pair+offset+5, UUID::LSB);
+#ifdef DEBUG
+      PRINTF("C UUID-");
+      const uint8_t *longUUIDBytes = uuid.getBaseUUID();
+      for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+        PRINTF("%02X", longUUIDBytes[i]);
+      }
+      PRINTF("\r\n");
+#endif
+    }
+
+    // Properties
+    DiscoveredCharacteristic::Properties_t p;
+
+    p._broadcast = (props_mask[0] & handle_value_pair[offset+2]);
+    p._read = (props_mask[1] & handle_value_pair[offset+2])>>1;
+    p._writeWoResp = (props_mask[2] & handle_value_pair[offset+2])>>2;
+    p._write = (props_mask[3] & handle_value_pair[offset+2])>>3;
+    p._notify = (props_mask[4] & handle_value_pair[offset+2])>>4;
+    p._indicate = (props_mask[5] & handle_value_pair[offset+2])>>5;
+    p._authSignedWrite = (props_mask[6] & handle_value_pair[offset+2])>>6;
+    PRINTF("p._broadcast=%d\n\r", p._broadcast);
+    PRINTF("p._read=%d\n\r", p._read);
+    PRINTF("p._writeWoResp=%d\n\r", p._writeWoResp);
+    PRINTF("p._write=%d\n\r", p._write);
+    PRINTF("p._notify=%d\n\r", p._notify);
+    PRINTF("p._indicate=%d\n\r", p._indicate);
+    PRINTF("p._authSignedWrite=%d\n\r", p._authSignedWrite);
+
+    /*
+    uint8_t props = handle_value_pair[offset+2];
+    PRINTF("CHAR PROPS: %d\n\r", props);
+    */
+
+    // Handles
+    declHandle = handle_value_pair[offset];
+    valueHandle = handle_value_pair[offset+3];
+    lastHandle = valueHandle+1;
+    PRINTF("declHandle: %u valueHandle=%u lastHandle=%u\n\r", declHandle, valueHandle, lastHandle);
+
+    discoveredChar[_numChars].setup(this,
+                                    connectionHandle,
+                                    uuid,
+                                    p,
+                                    declHandle,
+                                    valueHandle,
+                                    lastHandle);
+
+    if (_numChars != 0) {
+        discoveredChar[_numChars - 1].setLastHandle(declHandle - 1);
+
+        if(characteristicDiscoveryCallback) {
+          characteristicDiscoveryCallback(&discoveredChar[_numChars - 1]);
+        }
+    }
+
+    _numChars++;
+
+    offset += handle_value_pair_length;
+  }
+}
+
+void BlueNRGGattClient::serviceCharByUUIDCB(Gap::Handle_t connectionHandle,
+                                            uint8_t event_data_length,
+                                            uint16_t attr_handle,
+                                            uint8_t *attr_value)
+{
+  // Charac Properties(1), Charac Value Handle(2), Charac UUID(2/16)
+  GattAttribute::Handle_t declHandle, valueHandle, lastHandle;
+  UUID uuid;
+
+  PRINTF("serviceCharByUUIDCB\n\r");
+
+  // UUID Type
+  if (event_data_length == 7) {
+    PRINTF("Char UUID_TYPE_16\n\r");
+    uuid = attr_value[4]<<8|attr_value[3];
+    PRINTF("C UUID-%X\r\n", uuid.getShortUUID());
+  } else {
+    PRINTF("Char UUID_TYPE_128\n\r");
+    uuid.setupLong(attr_value+3, UUID::LSB);
+#ifdef DEBUG
+    PRINTF("C UUID-");
+    const uint8_t *longUUIDBytes = uuid.getBaseUUID();
+    for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+      PRINTF("%02X", longUUIDBytes[i]);
+    }
+    PRINTF("\r\n");
+#endif
+  }
+
+  // Properties
+  DiscoveredCharacteristic::Properties_t p;
+
+  p._broadcast = (props_mask[0] & attr_value[0]);
+  p._read = (props_mask[1] & attr_value[0])>>1;
+  p._writeWoResp = (props_mask[2] & attr_value[0])>>2;
+  p._write = (props_mask[3] & attr_value[0])>>3;
+  p._notify = (props_mask[4] & attr_value[0])>>4;
+  p._indicate = (props_mask[5] & attr_value[0])>>5;
+  p._authSignedWrite = (props_mask[6] & attr_value[0])>>6;
+  PRINTF("p._broadcast=%d\n\r", p._broadcast);
+  PRINTF("p._read=%d\n\r", p._read);
+  PRINTF("p._writeWoResp=%d\n\r", p._writeWoResp);
+  PRINTF("p._write=%d\n\r", p._write);
+  PRINTF("p._notify=%d\n\r", p._notify);
+  PRINTF("p._indicate=%d\n\r", p._indicate);
+  PRINTF("p._authSignedWrite=%d\n\r", p._authSignedWrite);
+
+  /*
+  uint8_t props = attr_value[0];
+  PRINTF("CHAR PROPS: %d\n\r", props);
+  */
+
+  // Handles
+  declHandle = attr_handle;
+  valueHandle = attr_value[1];
+  lastHandle = valueHandle+1;
+
+  discoveredChar[_numChars].setup(this,
+                                  connectionHandle,
+                                  uuid,
+                                  p,
+                                  declHandle,
+                                  valueHandle,
+                                  lastHandle);
+
+  if(characteristicDiscoveryCallback) {
+    characteristicDiscoveryCallback(&discoveredChar[_numChars]);
+  }
+  _numChars++;
+}
+
+ble_error_t BlueNRGGattClient::findServiceChars(Gap::Handle_t connectionHandle)
+{
+  PRINTF("findServiceChars\n\r");
+
+  tBleStatus ret;
+  uint8_t uuid_type = UUID_TYPE_16;
+  uint8_t short_uuid[2];
+  uint8_t *uuid = NULL;
+
+  DiscoveredService *service;
+
+  // complete the discovery of the last characteristic of the previous service.
+  // Its last handle wasn't known before this point
+  // update the handle and call the characteristic discovery callback.
+  if (_servIndex != 0 && _numChars != 0) {
+      discoveredChar[_numChars - 1].setLastHandle(discoveredService[_servIndex - 1].getEndHandle());
+
+      if(characteristicDiscoveryCallback) {
+        characteristicDiscoveryCallback(&discoveredChar[_numChars - 1]);
+      }
+  }
+
+  _numChars = 0;
+
+  // We finished chars discovery for all services
+  if(_servIndex >= _numServices) {
+    PRINTF("!!!We finished chars discovery for all services!!!\n\r");
+    //_currentState = GATT_CHARS_DISCOVERY_COMPLETE;
+
+    terminateServiceDiscovery();
+
+    return BLE_ERROR_NONE;
+  }
+
+  service = &discoveredService[_servIndex];
+  /*
+  if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) {
+    PRINTF("S UUID-%X\r\n", service->getUUID().getShortUUID());
+  } else {
+    PRINTF("S UUID-");
+    const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID();
+    for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+      PRINTF("%02X", longUUIDBytes[i]);
+    }
+    PRINTF("\r\n");
+  }
+  */
+
+  if(serviceDiscoveryCallback) {
+    serviceDiscoveryCallback(service);
+  }
+
+  PRINTF("findServiceChars (_servIndex=%d)\n\r", _servIndex);
+  //ret = aci_gatt_disc_all_charac_of_serv(connectionHandle, service->getStartHandle(), service->getEndHandle());
+
+    if(_matchingCharacteristicUUIDIn == BLE_UUID_UNKNOWN) {
+        PRINTF("findServiceChars (BLE_UUID_UNKNOWN)\n\r");
+        ret = aci_gatt_disc_all_charac_of_serv(connectionHandle, service->getStartHandle(), service->getEndHandle());
+    } else {
+
+        uint8_t type = _matchingCharacteristicUUIDIn.shortOrLong();
+
+        if(type == UUID::UUID_TYPE_SHORT) {
+            STORE_LE_16(short_uuid, _matchingCharacteristicUUIDIn.getShortUUID());
+
+            uuid_type = UUID_TYPE_16;
+            uuid = short_uuid;
+#ifdef DEBUG
+            PRINTF("findServiceChars C UUID-");
+            for(unsigned i = 0; i < 2; i++) {
+                PRINTF("%02X", short_uuid[i]);
+            }
+            PRINTF("\n\r");
+#endif
+        } else if(type==UUID::UUID_TYPE_LONG) {
+
+            uuid_type = UUID_TYPE_128;
+            uuid = (unsigned char*)_matchingCharacteristicUUIDIn.getBaseUUID();
+#ifdef DEBUG
+            PRINTF("(findServiceChars) C UUID-");
+            for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) {
+                PRINTF("%02X", uuid[i]);
+            }
+            PRINTF("\r\n");
+#endif
+        }
+
+        ret = aci_gatt_disc_charac_by_uuid(connectionHandle,
+                                           service->getStartHandle(),
+                                           service->getEndHandle(),
+                                           uuid_type,
+                                           uuid);
+    }
+
+  if(ret == BLE_STATUS_SUCCESS) {
+    _servIndex++;
+  }
+
+  PRINTF("findServiceChars ret=%d\n\r", ret);
+
+  return BLE_ERROR_NONE;
+}
+
+ble_error_t BlueNRGGattClient::launchServiceDiscovery(Gap::Handle_t                               connectionHandle,
+                                                      ServiceDiscovery::ServiceCallback_t         sc,
+                                                      ServiceDiscovery::CharacteristicCallback_t  cc,
+                                                      const UUID                                 &matchingServiceUUID,
+                                                      const UUID                                 &matchingCharacteristicUUIDIn)
+{
+  PRINTF("launchServiceDiscovery\n\r");
+
+  tBleStatus ret;
+  uint8_t uuid_type = UUID_TYPE_16;
+  uint8_t short_uuid[2];
+  uint8_t *uuid = NULL;
+  unsigned j;
+
+  if(isServiceDiscoveryActive()) {
+    return BLE_ERROR_OPERATION_NOT_PERMITTED;
+  }
+
+  if(!sc && !cc) {
+    // nothing to do
+    PRINTF("launchServiceDiscovery: nothing to do\n\r");
+    return BLE_ERROR_NONE;
+  }
+
+  _connectionHandle = connectionHandle;
+  serviceDiscoveryCallback = sc;
+  characteristicDiscoveryCallback = cc;
+  _matchingServiceUUID = matchingServiceUUID;
+  _matchingCharacteristicUUIDIn = matchingCharacteristicUUIDIn;
+
+  //reset services
+  _numServices = 0;
+  _numChars = 0;
+  _servIndex = 0;
+  for(j = 0; j < BLE_TOTAL_DISCOVERED_SERVICES; j++) {
+    discoveredService[j].setup(BLE_UUID_UNKNOWN, GattAttribute::INVALID_HANDLE, GattAttribute::INVALID_HANDLE);
+  }
+
+  if(matchingServiceUUID == BLE_UUID_UNKNOWN) {
+
+    // Wildcard: search for all services
+    ret = aci_gatt_disc_all_prim_services((uint16_t)connectionHandle);
+
+  } else {
+
+    uint8_t type = matchingServiceUUID.shortOrLong();
+    //PRINTF("AddService(): Type:%d\n\r", type);
+
+    if(type == UUID::UUID_TYPE_SHORT) {
+      STORE_LE_16(short_uuid, matchingServiceUUID.getShortUUID());
+#ifdef DEBUG
+      PRINTF("launchServiceDiscovery short_uuid=0x");
+      for(j = 0; j < 2; j++) {
+        PRINTF("%02X", short_uuid[j]);
+      }
+      PRINTF("\n\r");
+#endif
+
+      uuid_type = UUID_TYPE_16;
+      uuid = short_uuid;
+
+    } else if(type==UUID::UUID_TYPE_LONG) {
+
+      uuid_type = UUID_TYPE_128;
+      uuid = (unsigned char*)matchingServiceUUID.getBaseUUID();
+
+#ifdef DEBUG
+      PRINTF("launchServiceDiscovery base_uuid=0x");
+      for(j = 0; j < 16; j++) {
+        PRINTF("%02X", uuid[j]);
+      }
+      PRINTF("\n\r");
+#endif
+    }
+
+    // search for specific service by UUID
+    ret = aci_gatt_disc_prim_service_by_uuid((uint16_t)connectionHandle, uuid_type, uuid);
+    //ret = aci_gatt_disc_all_prim_services((uint16_t)connectionHandle);
+  }
+
+  if(ret == BLE_STATUS_SUCCESS) {
+    _currentState = GATT_SERVICE_DISCOVERY;
+  }
+
+  PRINTF("launchServiceDiscovery ret=%d\n\r", ret);
+
+  return BLE_ERROR_NONE;
+}
+
+ble_error_t BlueNRGGattClient::discoverServices(Gap::Handle_t                        connectionHandle,
+                                                ServiceDiscovery::ServiceCallback_t  callback,
+                                                const UUID                          &matchingServiceUUID)
+{
+  /* avoid compiler warnings about unused variables */
+  (void)connectionHandle;
+  (void)callback;
+  (void)matchingServiceUUID;
+
+  return BLE_ERROR_NOT_IMPLEMENTED;
+}
+
+ble_error_t BlueNRGGattClient::discoverServices(Gap::Handle_t                        connectionHandle,
+                                                ServiceDiscovery::ServiceCallback_t  callback,
+                                                GattAttribute::Handle_t              startHandle,
+                                                GattAttribute::Handle_t              endHandle)
+{
+  /* avoid compiler warnings about unused variables */
+  (void)connectionHandle;
+  (void)callback;
+  (void)startHandle;
+  (void)endHandle;
+
+  return BLE_ERROR_NOT_IMPLEMENTED;
+}
+
+bool BlueNRGGattClient::isServiceDiscoveryActive(void) const
+{
+  if(_currentState == GATT_SERVICE_DISCOVERY) {
+    return true;
+  }
+
+  return false;
+/*
+  if(_currentState == GATT_IDLE ||
+     _currentState == GATT_DISCOVERY_TERMINATED ||
+       _currentState == GATT_READ_CHAR ||
+         _currentState == GATT_WRITE_CHAR ) {
+    return false;
+  }
+
+  return true;
+*/
+}
+
+void BlueNRGGattClient::terminateServiceDiscovery(void)
+{
+  _currentState = GATT_IDLE;//GATT_DISCOVERY_TERMINATED;
+
+  if (terminationCallback) {
+    terminationCallback(_connectionHandle);
+  }
+}
+
+void BlueNRGGattClient::charReadCB(Gap::Handle_t connHandle,
+                                   uint8_t event_data_length,
+                                   uint8_t* attribute_value)
+{
+  readCBParams.connHandle = connHandle;
+  readCBParams.offset = 0;
+  readCBParams.len = event_data_length;
+  readCBParams.data = attribute_value;
+
+  BlueNRGGattClient::getInstance().processReadResponse(&readCBParams);
+}
+
+ble_error_t BlueNRGGattClient::read(Gap::Handle_t connHandle, GattAttribute::Handle_t attributeHandle, uint16_t offset) const
+{
+  /* avoid compiler warnings about unused variables */
+  (void)offset;
+
+  tBleStatus ret;
+
+  BlueNRGGattClient *gattc = const_cast<BlueNRGGattClient*>(this);
+
+  // Save the attribute_handle not provided by evt_att_read_resp
+  gattc->readCBParams.handle = attributeHandle;
+
+  // FIXME: We need to wait for a while before starting a read
+  // due to BlueNRG process queue handling
+  Clock_Wait(100);
+
+  ret = aci_gatt_read_charac_val(connHandle, attributeHandle);
+
+  if(ret == BLE_STATUS_SUCCESS) {
+    gattc->_currentState = GATT_READ_CHAR;
+    return BLE_ERROR_NONE;
+  }
+  switch (ret) {
+  case BLE_STATUS_BUSY:
+    return BLE_STACK_BUSY;
+  default:
+    return BLE_ERROR_INVALID_STATE;
+  }
+}
+
+void BlueNRGGattClient::charWritePrepareCB(Gap::Handle_t connHandle,
+                                           uint8_t event_data_length,
+                                           uint16_t attribute_handle,
+                                           uint16_t offset,
+                                           uint8_t *part_attr_value)
+{
+  /* avoid compiler warnings about unused variables */
+  (void)connHandle;
+
+  // Update the write response params
+  writeCBParams.handle = attribute_handle;
+  writeCBParams.offset = offset;
+  writeCBParams.len = event_data_length-4; //(?)
+  writeCBParams.data = part_attr_value;
+
+  BlueNRGGattClient::getInstance().processWriteResponse(&writeCBParams);
+}
+
+void BlueNRGGattClient::charWriteExecCB(Gap::Handle_t connHandle,
+                                        uint8_t event_data_length)
+{
+  /* avoid compiler warnings about unused variables */
+  (void)event_data_length;
+
+  writeCBParams.connHandle = connHandle;
+
+  BlueNRGGattClient::getInstance().processWriteResponse(&writeCBParams);
+}
+
+ble_error_t BlueNRGGattClient::write(GattClient::WriteOp_t    cmd,
+                                     Gap::Handle_t            connHandle,
+                                     GattAttribute::Handle_t  attributeHandle,
+                                     size_t                   length,
+                                     const uint8_t           *value) const
+{
+  /* avoid compiler warnings about unused variables */
+  (void)cmd;
+
+  tBleStatus ret;
+
+  BlueNRGGattClient *gattc = const_cast<BlueNRGGattClient*>(this);
+
+  // We save the write response params (used by the callback) because
+  // when the aci_gatt_write_charac_value() is used the only event received is the EVT_BLUE_GATT_PROCEDURE_COMPLETE
+  gattc->writeCBParams.connHandle = connHandle;
+  gattc->writeCBParams.writeOp = GattWriteCallbackParams::OP_WRITE_CMD;
+  gattc->writeCBParams.handle = attributeHandle;
+  gattc->writeCBParams.offset = 0;
+  gattc->writeCBParams.len = length;
+  gattc->writeCBParams.data = value;
+
+  ret = aci_gatt_write_charac_value(connHandle, attributeHandle, length, const_cast<uint8_t *>(value));
+  //ret = aci_gatt_write_charac_reliable(connHandle, attributeHandle, 0, length, const_cast<uint8_t *>(value));
+
+  if (ret == BLE_STATUS_SUCCESS) {
+    gattc->_currentState = GATT_WRITE_CHAR;
+    return BLE_ERROR_NONE;
+  }
+  switch (ret) {
+  case BLE_STATUS_BUSY:
+    return BLE_STACK_BUSY;
+  default:
+    return BLE_ERROR_INVALID_STATE;
+  }
+
+}
+
+void BlueNRGGattClient::discAllCharacDescCB(Gap::Handle_t connHandle,
+                                            uint8_t event_data_length,
+                                            uint8_t format,
+                                            uint8_t *handle_uuid_pair) {
+  GattAttribute::Handle_t attHandle;
+  UUID uuid;
+  uint8_t i, numCharacDesc, offset, handle_uuid_length;
+
+  handle_uuid_length = 4; //Handle + UUID_16
+  if (format == 2)
+    handle_uuid_length = 18; //Handle + UUID_128
+
+  numCharacDesc = (event_data_length - 1) / handle_uuid_length;
+
+  offset = 0;
+
+  PRINTF("\r\ncharacteristic descriptor discovered: data length %u, format %u\r\n",
+    event_data_length, format);
+
+
+  for (i=0; i<numCharacDesc; i++) {
+    memcpy(&attHandle, handle_uuid_pair + offset, sizeof(attHandle));
+
+    // UUID Type
+    if (handle_uuid_length == 4) {
+
+      PRINTF("UUID_TYPE_16\n\r");
+      uuid = handle_uuid_pair[offset+3]<<8|handle_uuid_pair[offset+2];
+      PRINTF("D UUID-%X attHandle=%u\r\n", uuid.getShortUUID(), attHandle);
+
+    } else {
+
+      PRINTF("UUID_TYPE_128\n\r");
+      uuid.setupLong(handle_uuid_pair+offset+2, UUID::LSB);
+#ifdef DEBUG
+      PRINTF("D UUID-");
+      const uint8_t *longUUIDBytes = uuid.getBaseUUID();
+      for (unsigned j = 0; j < UUID::LENGTH_OF_LONG_UUID; j++) {
+        PRINTF("%02x", longUUIDBytes[j]);
+      }
+#endif
+     }
+
+     if(charDescDiscoveryCallback != NULL) {
+       CharacteristicDescriptorDiscovery::DiscoveryCallbackParams_t params = {
+                                 _characteristic,
+                                 DiscoveredCharacteristicDescriptor(
+                                   _characteristic.getGattClient(),
+                                   connHandle,
+                                   attHandle,
+                                   uuid
+                                 )
+       };
+       charDescDiscoveryCallback(&params);
+     }
+
+    _numCharDesc++;
+
+    offset += handle_uuid_length;
+  }
+}
+
+ble_error_t BlueNRGGattClient::discoverCharacteristicDescriptors(
+        const DiscoveredCharacteristic& characteristic,
+        const CharacteristicDescriptorDiscovery::DiscoveryCallback_t& discoveryCallback,
+        const CharacteristicDescriptorDiscovery::TerminationCallback_t& terminationCallback) {
+
+  tBleStatus ret;
+
+  if(_currentState != GATT_IDLE) {
+    return BLE_ERROR_OPERATION_NOT_PERMITTED;
+  }
+
+  charDescDiscoveryCallback = discoveryCallback;
+  charDescTerminationCallback = terminationCallback;
+
+  Gap::Handle_t connHandle = characteristic.getConnectionHandle();
+  GattAttribute::Handle_t valueHandle = characteristic.getValueHandle();
+  GattAttribute::Handle_t lastHandle = characteristic.getLastHandle();
+
+  PRINTF("Starting aci_gatt_disc_all_charac_descriptors... [%u : %u]\n\r", valueHandle, lastHandle);
+  ret = aci_gatt_disc_all_charac_descriptors(connHandle, valueHandle, lastHandle);
+
+  if (ret == BLE_STATUS_SUCCESS) {
+    _currentState = GATT_CHAR_DESC_DISCOVERY;
+    _characteristic = characteristic;
+    return BLE_ERROR_NONE;
+  }
+  switch (ret) {
+  case BLE_STATUS_INVALID_PARAMS:
+    return BLE_ERROR_INVALID_PARAM;
+  default:
+    return BLE_ERROR_OPERATION_NOT_PERMITTED;
+  }
+}
+
+/**************************************************************************/
+/*!
+    @brief  Clear BlueNRGGattServer's state.
+
+    @returns    ble_error_t
+
+    @retval     BLE_ERROR_NONE
+                Everything executed properly
+*/
+/**************************************************************************/
+ble_error_t BlueNRGGattClient::reset(void) {
+  /* Clear all state that is from the parent, including private members */
+  if (GattClient::reset() != BLE_ERROR_NONE) {
+    return BLE_ERROR_INVALID_STATE;
+  }
+
+  _currentState = GATT_IDLE;
+  _matchingServiceUUID = BLE_UUID_UNKNOWN;
+  _matchingCharacteristicUUIDIn = BLE_UUID_UNKNOWN;
+
+  _numServices = 0;
+  _servIndex = 0;
+  _numChars = 0;
+  _numCharDesc = 0;
+
+  /* Clear class members */
+  memset(discoveredService, 0, sizeof(discoveredService));
+  memset(discoveredChar, 0, sizeof(discoveredChar));
+
+  return BLE_ERROR_NONE;
+}