A GattClient example based on ST BlueNRG driving an LED service exported by a BLE_LED peripheral. Shows scanning, connections, service-discovery, and reads/writes.
Dependencies: BLE_API X_NUCLEO_IDB0XA1 mbed
main.cpp
- Committer:
- apalmieri
- Date:
- 2016-02-26
- Revision:
- 3:b2bf47485f85
- Parent:
- 2:c944cfe08e79
File content as of revision 3:b2bf47485f85:
/* 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 "mbed.h" #include "ble/BLE.h" #include "ble/DiscoveredCharacteristic.h" #include "ble/DiscoveredService.h" #define SCAN_INT 0x30 // 30 ms = 48 * 0.625 ms #define SCAN_WIND 0x30 // 30 ms = 48 * 0.625 ms const Gap::Address_t BLE_address_BE = {0xCC, 0x00, 0x00, 0xE1, 0x80, 0x02}; const Gap::Address_t BLE_peer_address_BE = {0xFD, 0x66, 0x05, 0x13, 0xBE, 0xBA}; DiscoveredCharacteristic ledCharacteristic; uint8_t toggledValue = 0; enum { READ = 0, WRITE, IDLE }; static volatile unsigned int triggerOp = IDLE; void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *params) { (void)params; printf("disconnected\n\r"); } void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) { if (params->peerAddr[0] != BLE_peer_address_BE[0]) { return; } printf("adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n", params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type); if(!params->isScanResponse) { BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_PUBLIC, NULL, NULL); } } void discoveryTerminationCallback(Gap::Handle_t connectionHandle) { printf("terminated SD for handle %u\r\n", connectionHandle); } void serviceDiscoveryCallback(const DiscoveredService *service) { if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) { printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle()); } 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(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle()); } } void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) { //printf(" C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast()); if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */ //printf(" C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast()); ledCharacteristic = *characteristicP; triggerOp = READ; } } void connectionCallback(const Gap::ConnectionCallbackParams_t *params) { uint16_t LED_SERVICE_UUID = 0xA000; uint16_t LED_STATE_CHARACTERISTIC_UUID = 0xA001; if (params->role == Gap::CENTRAL) { BLE &ble = BLE::Instance(); ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback); ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, LED_SERVICE_UUID, LED_STATE_CHARACTERISTIC_UUID); } } void triggerToggledWrite(const GattReadCallbackParams *response) { if (response->handle == ledCharacteristic.getValueHandle()) { #if 0 printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len); for (unsigned index = 0; index < response->len; index++) { printf("%c[%02x]", response->data[index], response->data[index]); } printf("\r\n"); #endif toggledValue = response->data[0] ^ 0x1; triggerOp = WRITE; } } void triggerRead(const GattWriteCallbackParams *response) { if (response->handle == ledCharacteristic.getValueHandle()) { triggerOp = READ; } } /** * This function is called when the ble initialization process has failled */ void onBleInitError(BLE &ble, ble_error_t error) { /* Initialization error handling should go here */ } /** * Callback triggered when the ble initialization process has finished */ void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) { BLE& ble = params->ble; ble_error_t error = params->error; if (error != BLE_ERROR_NONE) { /* In case of error, forward the error handling to onBleInitError */ onBleInitError(ble, error); return; } /* Ensure that it is the default instance of BLE */ if(ble.getInstanceID() != BLE::DEFAULT_INSTANCE) { return; } // Set BT Address ble.gap().setAddress(BLEProtocol::AddressType::PUBLIC, BLE_address_BE); ble.gap().onConnection(connectionCallback); ble.onDisconnection(disconnectionCallback); ble.gattClient().onDataRead(triggerToggledWrite); ble.gattClient().onDataWrite(triggerRead); ble.gap().setScanParams(SCAN_INT, SCAN_WIND); ble.gap().startScan(advertisementCallback); // infinite loop while (1) { if (!ble.gattClient().isServiceDiscoveryActive()) { switch(triggerOp) { case READ: triggerOp = IDLE; ledCharacteristic.read(); break; case WRITE: triggerOp = IDLE; ledCharacteristic.write(1, &toggledValue); break; } } ble.waitForEvent(); } } int main(void) { BLE::Instance().init(bleInitComplete); }