File content as of revision 964:d111d9454aa9:

/* 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.
 */

#include "ble/DiscoveredCharacteristic.h"
#include "ble/GattClient.h"

ble_error_t
DiscoveredCharacteristic::read(uint16_t offset) const
{
    if (!props.read()) {
        return BLE_ERROR_OPERATION_NOT_PERMITTED;
    }

    if (!gattc) {
        return BLE_ERROR_INVALID_STATE;
    }

    return gattc->read(connHandle, valueHandle, offset);
}


struct OneShotReadCallback { 
    static void launch(GattClient* client, Gap::Handle_t connHandle, 
                       GattAttribute::Handle_t handle,const GattClient::ReadCallback_t& cb) { 
        OneShotReadCallback* oneShot = new OneShotReadCallback(client, connHandle, handle, cb);
        oneShot->attach();
        // delete will be made when this callback is called
    }

private:
    OneShotReadCallback(GattClient* client, Gap::Handle_t connHandle, 
                        GattAttribute::Handle_t handle, const GattClient::ReadCallback_t& cb) : 
        _client(client),
        _connHandle(connHandle),
        _handle(handle),
        _callback(cb) { } 

    void attach() { 
        _client->onDataRead(makeFunctionPointer(this, &OneShotReadCallback::call));
    }

    void call(const GattReadCallbackParams* params) {
        // verifiy that it is the right characteristic on the right connection
        if(params->connHandle == _connHandle && params->handle == _handle) { 
            _callback(params);
            _client->onDataRead().detach(makeFunctionPointer(this, &OneShotReadCallback::call));
            delete this;
        }
    }

    GattClient* _client;
    Gap::Handle_t _connHandle;
    GattAttribute::Handle_t _handle;
    GattClient::ReadCallback_t _callback;
};

ble_error_t DiscoveredCharacteristic::read(uint16_t offset, const GattClient::ReadCallback_t& onRead) const {
    ble_error_t error = read(offset);
    if(error) { 
        return error;
    }

    OneShotReadCallback::launch(gattc, connHandle, valueHandle, onRead);

    return error;
}




ble_error_t
DiscoveredCharacteristic::write(uint16_t length, const uint8_t *value) const
{
    if (!props.write()) {
        return BLE_ERROR_OPERATION_NOT_PERMITTED;
    }

    if (!gattc) {
        return BLE_ERROR_INVALID_STATE;
    }

    return gattc->write(GattClient::GATT_OP_WRITE_REQ, connHandle, valueHandle, length, value);
}

ble_error_t
DiscoveredCharacteristic::writeWoResponse(uint16_t length, const uint8_t *value) const
{
    if (!props.writeWoResp()) {
        return BLE_ERROR_OPERATION_NOT_PERMITTED;
    }

    if (!gattc) {
        return BLE_ERROR_INVALID_STATE;
    }

    return gattc->write(GattClient::GATT_OP_WRITE_CMD, connHandle, valueHandle, length, value);
}

ble_error_t
DiscoveredCharacteristic::discoverDescriptors(DescriptorCallback_t callback, const UUID &matchingUUID) const
{
    return BLE_ERROR_NOT_IMPLEMENTED; /* TODO: this needs to be filled in. */
}