Basic message sending over an ad hoc ble network
Fork of mbed-os-example-ble-LEDBlinker by
source/main.cpp@0:86bf1d2040b3, 2016-07-26 (annotated)
- Committer:
- Vincent Coubard
- Date:
- Tue Jul 26 14:49:03 2016 +0100
- Revision:
- 0:86bf1d2040b3
- Child:
- 4:9a6b0d5ea664
Update example at tag mbed-os-5.0.1-rc1
Who changed what in which revision?
User | Revision | Line number | New contents of line |
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Vincent Coubard |
0:86bf1d2040b3 | 1 | /* mbed Microcontroller Library |
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0:86bf1d2040b3 | 2 | * Copyright (c) 2006-2015 ARM Limited |
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0:86bf1d2040b3 | 3 | * |
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0:86bf1d2040b3 | 4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
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0:86bf1d2040b3 | 5 | * you may not use this file except in compliance with the License. |
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0:86bf1d2040b3 | 6 | * You may obtain a copy of the License at |
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0:86bf1d2040b3 | 7 | * |
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0:86bf1d2040b3 | 8 | * http://www.apache.org/licenses/LICENSE-2.0 |
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0:86bf1d2040b3 | 9 | * |
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0:86bf1d2040b3 | 10 | * Unless required by applicable law or agreed to in writing, software |
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0:86bf1d2040b3 | 11 | * distributed under the License is distributed on an "AS IS" BASIS, |
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0:86bf1d2040b3 | 12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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0:86bf1d2040b3 | 13 | * See the License for the specific language governing permissions and |
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0:86bf1d2040b3 | 14 | * limitations under the License. |
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0:86bf1d2040b3 | 15 | */ |
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0:86bf1d2040b3 | 16 | |
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0:86bf1d2040b3 | 17 | #include <mbed-events/events.h> |
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0:86bf1d2040b3 | 18 | #include <mbed.h> |
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0:86bf1d2040b3 | 19 | #include "ble/BLE.h" |
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0:86bf1d2040b3 | 20 | #include "ble/DiscoveredCharacteristic.h" |
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0:86bf1d2040b3 | 21 | #include "ble/DiscoveredService.h" |
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0:86bf1d2040b3 | 22 | |
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0:86bf1d2040b3 | 23 | DigitalOut alivenessLED(LED1, 1); |
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0:86bf1d2040b3 | 24 | static DiscoveredCharacteristic ledCharacteristic; |
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0:86bf1d2040b3 | 25 | static bool triggerLedCharacteristic; |
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0:86bf1d2040b3 | 26 | static const char PEER_NAME[] = "LED"; |
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0:86bf1d2040b3 | 27 | |
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0:86bf1d2040b3 | 28 | static EventQueue eventQueue( |
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0:86bf1d2040b3 | 29 | /* event count */ 16 * /* event size */ 32 |
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0:86bf1d2040b3 | 30 | ); |
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0:86bf1d2040b3 | 31 | |
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0:86bf1d2040b3 | 32 | void periodicCallback(void) { |
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0:86bf1d2040b3 | 33 | alivenessLED = !alivenessLED; /* Do blinky on LED1 while we're waiting for BLE events */ |
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0:86bf1d2040b3 | 34 | } |
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0:86bf1d2040b3 | 35 | |
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0:86bf1d2040b3 | 36 | void advertisementCallback(const Gap::AdvertisementCallbackParams_t *params) { |
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0:86bf1d2040b3 | 37 | // parse the advertising payload, looking for data type COMPLETE_LOCAL_NAME |
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0:86bf1d2040b3 | 38 | // The advertising payload is a collection of key/value records where |
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0:86bf1d2040b3 | 39 | // byte 0: length of the record excluding this byte |
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0:86bf1d2040b3 | 40 | // byte 1: The key, it is the type of the data |
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0:86bf1d2040b3 | 41 | // byte [2..N] The value. N is equal to byte0 - 1 |
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0:86bf1d2040b3 | 42 | for (uint8_t i = 0; i < params->advertisingDataLen; ++i) { |
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0:86bf1d2040b3 | 43 | |
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0:86bf1d2040b3 | 44 | const uint8_t record_length = params->advertisingData[i]; |
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0:86bf1d2040b3 | 45 | if (record_length == 0) { |
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0:86bf1d2040b3 | 46 | continue; |
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0:86bf1d2040b3 | 47 | } |
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0:86bf1d2040b3 | 48 | const uint8_t type = params->advertisingData[i + 1]; |
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0:86bf1d2040b3 | 49 | const uint8_t* value = params->advertisingData + i + 2; |
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0:86bf1d2040b3 | 50 | const uint8_t value_length = record_length - 1; |
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0:86bf1d2040b3 | 51 | |
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0:86bf1d2040b3 | 52 | if(type == GapAdvertisingData::COMPLETE_LOCAL_NAME) { |
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0:86bf1d2040b3 | 53 | if ((value_length == sizeof(PEER_NAME)) && (memcmp(value, PEER_NAME, value_length) == 0)) { |
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0:86bf1d2040b3 | 54 | printf( |
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0:86bf1d2040b3 | 55 | "adv peerAddr[%02x %02x %02x %02x %02x %02x] rssi %d, isScanResponse %u, AdvertisementType %u\r\n", |
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0:86bf1d2040b3 | 56 | params->peerAddr[5], params->peerAddr[4], params->peerAddr[3], params->peerAddr[2], |
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0:86bf1d2040b3 | 57 | params->peerAddr[1], params->peerAddr[0], params->rssi, params->isScanResponse, params->type |
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0:86bf1d2040b3 | 58 | ); |
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0:86bf1d2040b3 | 59 | BLE::Instance().gap().connect(params->peerAddr, Gap::ADDR_TYPE_RANDOM_STATIC, NULL, NULL); |
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0:86bf1d2040b3 | 60 | break; |
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0:86bf1d2040b3 | 61 | } |
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0:86bf1d2040b3 | 62 | } |
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0:86bf1d2040b3 | 63 | i += record_length; |
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0:86bf1d2040b3 | 64 | } |
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0:86bf1d2040b3 | 65 | } |
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0:86bf1d2040b3 | 66 | |
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0:86bf1d2040b3 | 67 | void serviceDiscoveryCallback(const DiscoveredService *service) { |
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0:86bf1d2040b3 | 68 | if (service->getUUID().shortOrLong() == UUID::UUID_TYPE_SHORT) { |
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0:86bf1d2040b3 | 69 | printf("S UUID-%x attrs[%u %u]\r\n", service->getUUID().getShortUUID(), service->getStartHandle(), service->getEndHandle()); |
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0:86bf1d2040b3 | 70 | } else { |
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0:86bf1d2040b3 | 71 | printf("S UUID-"); |
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0:86bf1d2040b3 | 72 | const uint8_t *longUUIDBytes = service->getUUID().getBaseUUID(); |
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0:86bf1d2040b3 | 73 | for (unsigned i = 0; i < UUID::LENGTH_OF_LONG_UUID; i++) { |
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0:86bf1d2040b3 | 74 | printf("%02x", longUUIDBytes[i]); |
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0:86bf1d2040b3 | 75 | } |
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0:86bf1d2040b3 | 76 | printf(" attrs[%u %u]\r\n", service->getStartHandle(), service->getEndHandle()); |
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0:86bf1d2040b3 | 77 | } |
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0:86bf1d2040b3 | 78 | } |
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0:86bf1d2040b3 | 79 | |
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0:86bf1d2040b3 | 80 | void updateLedCharacteristic(void) { |
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0:86bf1d2040b3 | 81 | if (!BLE::Instance().gattClient().isServiceDiscoveryActive()) { |
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0:86bf1d2040b3 | 82 | ledCharacteristic.read(); |
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0:86bf1d2040b3 | 83 | } |
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0:86bf1d2040b3 | 84 | } |
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0:86bf1d2040b3 | 85 | |
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0:86bf1d2040b3 | 86 | void characteristicDiscoveryCallback(const DiscoveredCharacteristic *characteristicP) { |
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0:86bf1d2040b3 | 87 | printf(" C UUID-%x valueAttr[%u] props[%x]\r\n", characteristicP->getUUID().getShortUUID(), characteristicP->getValueHandle(), (uint8_t)characteristicP->getProperties().broadcast()); |
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0:86bf1d2040b3 | 88 | if (characteristicP->getUUID().getShortUUID() == 0xa001) { /* !ALERT! Alter this filter to suit your device. */ |
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0:86bf1d2040b3 | 89 | ledCharacteristic = *characteristicP; |
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0:86bf1d2040b3 | 90 | triggerLedCharacteristic = true; |
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0:86bf1d2040b3 | 91 | } |
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0:86bf1d2040b3 | 92 | } |
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0:86bf1d2040b3 | 93 | |
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0:86bf1d2040b3 | 94 | void discoveryTerminationCallback(Gap::Handle_t connectionHandle) { |
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0:86bf1d2040b3 | 95 | printf("terminated SD for handle %u\r\n", connectionHandle); |
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0:86bf1d2040b3 | 96 | if (triggerLedCharacteristic) { |
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0:86bf1d2040b3 | 97 | triggerLedCharacteristic = false; |
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0:86bf1d2040b3 | 98 | eventQueue.post(updateLedCharacteristic); |
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0:86bf1d2040b3 | 99 | } |
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0:86bf1d2040b3 | 100 | } |
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0:86bf1d2040b3 | 101 | |
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0:86bf1d2040b3 | 102 | void connectionCallback(const Gap::ConnectionCallbackParams_t *params) { |
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0:86bf1d2040b3 | 103 | if (params->role == Gap::CENTRAL) { |
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0:86bf1d2040b3 | 104 | BLE &ble = BLE::Instance(); |
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0:86bf1d2040b3 | 105 | ble.gattClient().onServiceDiscoveryTermination(discoveryTerminationCallback); |
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0:86bf1d2040b3 | 106 | ble.gattClient().launchServiceDiscovery(params->handle, serviceDiscoveryCallback, characteristicDiscoveryCallback, 0xa000, 0xa001); |
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0:86bf1d2040b3 | 107 | } |
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0:86bf1d2040b3 | 108 | } |
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0:86bf1d2040b3 | 109 | |
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0:86bf1d2040b3 | 110 | void triggerToggledWrite(const GattReadCallbackParams *response) { |
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0:86bf1d2040b3 | 111 | if (response->handle == ledCharacteristic.getValueHandle()) { |
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0:86bf1d2040b3 | 112 | printf("triggerToggledWrite: handle %u, offset %u, len %u\r\n", response->handle, response->offset, response->len); |
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0:86bf1d2040b3 | 113 | for (unsigned index = 0; index < response->len; index++) { |
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0:86bf1d2040b3 | 114 | printf("%c[%02x]", response->data[index], response->data[index]); |
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0:86bf1d2040b3 | 115 | } |
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0:86bf1d2040b3 | 116 | printf("\r\n"); |
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0:86bf1d2040b3 | 117 | |
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0:86bf1d2040b3 | 118 | uint8_t toggledValue = response->data[0] ^ 0x1; |
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0:86bf1d2040b3 | 119 | ledCharacteristic.write(1, &toggledValue); |
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0:86bf1d2040b3 | 120 | } |
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0:86bf1d2040b3 | 121 | } |
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0:86bf1d2040b3 | 122 | |
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0:86bf1d2040b3 | 123 | void triggerRead(const GattWriteCallbackParams *response) { |
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0:86bf1d2040b3 | 124 | if (response->handle == ledCharacteristic.getValueHandle()) { |
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0:86bf1d2040b3 | 125 | ledCharacteristic.read(); |
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0:86bf1d2040b3 | 126 | } |
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0:86bf1d2040b3 | 127 | } |
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0:86bf1d2040b3 | 128 | |
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0:86bf1d2040b3 | 129 | void disconnectionCallback(const Gap::DisconnectionCallbackParams_t *) { |
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0:86bf1d2040b3 | 130 | printf("disconnected\r\n"); |
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0:86bf1d2040b3 | 131 | /* Start scanning and try to connect again */ |
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0:86bf1d2040b3 | 132 | BLE::Instance().gap().startScan(advertisementCallback); |
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0:86bf1d2040b3 | 133 | } |
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0:86bf1d2040b3 | 134 | |
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0:86bf1d2040b3 | 135 | void onBleInitError(BLE &ble, ble_error_t error) |
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0:86bf1d2040b3 | 136 | { |
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0:86bf1d2040b3 | 137 | /* Initialization error handling should go here */ |
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0:86bf1d2040b3 | 138 | } |
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0:86bf1d2040b3 | 139 | |
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0:86bf1d2040b3 | 140 | void bleInitComplete(BLE::InitializationCompleteCallbackContext *params) |
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0:86bf1d2040b3 | 141 | { |
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0:86bf1d2040b3 | 142 | BLE& ble = params->ble; |
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0:86bf1d2040b3 | 143 | ble_error_t error = params->error; |
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0:86bf1d2040b3 | 144 | |
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0:86bf1d2040b3 | 145 | if (error != BLE_ERROR_NONE) { |
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0:86bf1d2040b3 | 146 | /* In case of error, forward the error handling to onBleInitError */ |
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0:86bf1d2040b3 | 147 | onBleInitError(ble, error); |
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0:86bf1d2040b3 | 148 | return; |
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0:86bf1d2040b3 | 149 | } |
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0:86bf1d2040b3 | 150 | |
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0:86bf1d2040b3 | 151 | /* Ensure that it is the default instance of BLE */ |
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0:86bf1d2040b3 | 152 | if (ble.getInstanceID() != BLE::DEFAULT_INSTANCE) { |
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0:86bf1d2040b3 | 153 | return; |
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0:86bf1d2040b3 | 154 | } |
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0:86bf1d2040b3 | 155 | |
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0:86bf1d2040b3 | 156 | ble.gap().onDisconnection(disconnectionCallback); |
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0:86bf1d2040b3 | 157 | ble.gap().onConnection(connectionCallback); |
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0:86bf1d2040b3 | 158 | |
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0:86bf1d2040b3 | 159 | ble.gattClient().onDataRead(triggerToggledWrite); |
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0:86bf1d2040b3 | 160 | ble.gattClient().onDataWrite(triggerRead); |
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0:86bf1d2040b3 | 161 | |
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0:86bf1d2040b3 | 162 | // scan interval: 400ms and scan window: 400ms. |
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0:86bf1d2040b3 | 163 | // Every 400ms the device will scan for 400ms |
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0:86bf1d2040b3 | 164 | // This means that the device will scan continuously. |
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0:86bf1d2040b3 | 165 | ble.gap().setScanParams(400, 400); |
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0:86bf1d2040b3 | 166 | ble.gap().startScan(advertisementCallback); |
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0:86bf1d2040b3 | 167 | } |
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0:86bf1d2040b3 | 168 | |
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0:86bf1d2040b3 | 169 | void scheduleBleEventsProcessing(BLE::OnEventsToProcessCallbackContext* context) { |
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0:86bf1d2040b3 | 170 | BLE &ble = BLE::Instance(); |
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0:86bf1d2040b3 | 171 | eventQueue.post(Callback<void()>(&ble, &BLE::processEvents)); |
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0:86bf1d2040b3 | 172 | } |
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0:86bf1d2040b3 | 173 | |
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0:86bf1d2040b3 | 174 | int main() |
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0:86bf1d2040b3 | 175 | { |
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0:86bf1d2040b3 | 176 | triggerLedCharacteristic = false; |
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0:86bf1d2040b3 | 177 | eventQueue.post_every(periodicCallback, 500); |
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0:86bf1d2040b3 | 178 | |
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0:86bf1d2040b3 | 179 | BLE &ble = BLE::Instance(); |
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0:86bf1d2040b3 | 180 | ble.onEventsToProcess(scheduleBleEventsProcessing); |
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0:86bf1d2040b3 | 181 | ble.init(bleInitComplete); |
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0:86bf1d2040b3 | 182 | |
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0:86bf1d2040b3 | 183 | while (true) { |
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0:86bf1d2040b3 | 184 | eventQueue.dispatch(); |
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0:86bf1d2040b3 | 185 | } |
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0:86bf1d2040b3 | 186 | |
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0:86bf1d2040b3 | 187 | return 0; |
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0:86bf1d2040b3 | 188 | } |