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feat(ble): Add simultaneous client and server example #12141
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,280 @@ | ||
| /* | ||
| * BLE Client and Server Coexistence Example | ||
| * | ||
| * This example demonstrates how to run both BLE client and server | ||
| * functionality on the same ESP32 device simultaneously. | ||
| * | ||
| * The device will: | ||
| * - Act as a BLE server, advertising a service with a characteristic | ||
| * - Act as a BLE client, scanning for other BLE servers | ||
| * - Connect to found servers and interact with their services | ||
| * - Handle both incoming and outgoing connections | ||
| * | ||
| * You can test this example by uploading it to two ESP32 boards. | ||
| * | ||
| * Author: lucasssvaz | ||
| * Based on Arduino BLE examples | ||
| */ | ||
|
|
||
| #include <BLEDevice.h> | ||
| #include <BLEUtils.h> | ||
| #include <BLEServer.h> | ||
| #include <BLEClient.h> | ||
| #include <BLEScan.h> | ||
|
|
||
| // Server-side definitions | ||
| #define SERVER_SERVICE_UUID "4fafc201-1fb5-459e-8fcc-c5c9c331914b" | ||
| #define SERVER_CHARACTERISTIC_UUID "beb5483e-36e1-4688-b7f5-ea07361b26a8" | ||
|
|
||
| // Client-side definitions (looking for the same service) | ||
| static BLEUUID clientServiceUUID(SERVER_SERVICE_UUID); | ||
| static BLEUUID clientCharUUID(SERVER_CHARACTERISTIC_UUID); | ||
|
|
||
| // Server objects | ||
| BLEServer *pServer = nullptr; | ||
| BLECharacteristic *pServerCharacteristic = nullptr; | ||
|
|
||
| // Client objects | ||
| static boolean doConnect = false; | ||
| static boolean clientConnected = false; | ||
| static BLERemoteCharacteristic *pRemoteCharacteristic; | ||
| static BLEAdvertisedDevice *targetDevice; | ||
| static BLEClient *pClient = nullptr; | ||
| BLEScan *pBLEScan = nullptr; | ||
|
|
||
| // Server callbacks | ||
| class ServerCallbacks : public BLEServerCallbacks { | ||
| void onConnect(BLEServer *pServer) { | ||
| Serial.println("Server: Client connected"); | ||
| } | ||
|
|
||
| void onDisconnect(BLEServer *pServer) { | ||
| Serial.println("Server: Client disconnected"); | ||
| // Restart advertising | ||
| BLEDevice::startAdvertising(); | ||
| } | ||
| }; | ||
|
|
||
| // Characteristic callbacks for server | ||
| class CharacteristicCallbacks : public BLECharacteristicCallbacks { | ||
| void onWrite(BLECharacteristic *pCharacteristic) { | ||
| String value = pCharacteristic->getValue(); | ||
| Serial.print("Server: Characteristic written, value: "); | ||
| Serial.println(value.c_str()); | ||
| } | ||
|
|
||
| void onRead(BLECharacteristic *pCharacteristic) { | ||
| Serial.println("Server: Characteristic read"); | ||
| } | ||
| }; | ||
|
|
||
| // Client callbacks | ||
| class ClientCallbacks : public BLEClientCallbacks { | ||
| void onConnect(BLEClient *pClient) { | ||
| Serial.println("Client: Connected to server"); | ||
| clientConnected = true; | ||
| } | ||
|
|
||
| void onDisconnect(BLEClient *pClient) { | ||
| Serial.println("Client: Disconnected from server"); | ||
| clientConnected = false; | ||
| } | ||
| }; | ||
|
|
||
| // Client notification callback | ||
| static void notifyCallback(BLERemoteCharacteristic *pBLERemoteCharacteristic, uint8_t *pData, size_t length, bool isNotify) { | ||
| Serial.print("Client: Notify callback for characteristic "); | ||
| Serial.print(pBLERemoteCharacteristic->getUUID().toString().c_str()); | ||
| Serial.print(" of data length "); | ||
| Serial.println(length); | ||
| Serial.print("Client: Data: "); | ||
| Serial.write(pData, length); | ||
| Serial.println(); | ||
| } | ||
|
|
||
| // Scan callbacks | ||
| class AdvertisedDeviceCallbacks : public BLEAdvertisedDeviceCallbacks { | ||
| void onResult(BLEAdvertisedDevice advertisedDevice) { | ||
| Serial.print("Client: Found device: "); | ||
| Serial.println(advertisedDevice.toString().c_str()); | ||
|
|
||
| // Check if this device has our target service | ||
| if (advertisedDevice.haveServiceUUID() && advertisedDevice.isAdvertisingService(clientServiceUUID) && !clientConnected) { | ||
|
|
||
| Serial.println("Client: Found target service, attempting connection..."); | ||
| BLEDevice::getScan()->stop(); | ||
| targetDevice = new BLEAdvertisedDevice(advertisedDevice); | ||
| doConnect = true; | ||
| } | ||
| } | ||
| }; | ||
|
|
||
| bool connectToServer() { | ||
| Serial.print("Client: Forming connection to "); | ||
| Serial.println(targetDevice->getAddress().toString().c_str()); | ||
|
|
||
| // Create client if it doesn't exist, otherwise reuse existing one | ||
| if (pClient == nullptr) { | ||
| pClient = BLEDevice::createClient(); | ||
| pClient->setClientCallbacks(new ClientCallbacks()); | ||
| Serial.println("Client: Created new client"); | ||
| } else { | ||
| Serial.println("Client: Reusing existing client"); | ||
| } | ||
|
|
||
| if (!pClient->connect(targetDevice)) { | ||
| Serial.println("Client: Failed to connect"); | ||
| return false; | ||
| } | ||
|
|
||
| Serial.println("Client: Connected to server"); | ||
| pClient->setMTU(517); // Request maximum MTU | ||
|
|
||
| // Get the service | ||
| BLERemoteService *pRemoteService = pClient->getService(clientServiceUUID); | ||
| if (pRemoteService == nullptr) { | ||
| Serial.print("Client: Failed to find service UUID: "); | ||
| Serial.println(clientServiceUUID.toString().c_str()); | ||
| pClient->disconnect(); | ||
| return false; | ||
| } | ||
| Serial.println("Client: Found service"); | ||
|
|
||
| // Get the characteristic | ||
| pRemoteCharacteristic = pRemoteService->getCharacteristic(clientCharUUID); | ||
| if (pRemoteCharacteristic == nullptr) { | ||
| Serial.print("Client: Failed to find characteristic UUID: "); | ||
| Serial.println(clientCharUUID.toString().c_str()); | ||
| pClient->disconnect(); | ||
| return false; | ||
| } | ||
| Serial.println("Client: Found characteristic"); | ||
|
|
||
| // Read the initial value | ||
| if (pRemoteCharacteristic->canRead()) { | ||
| String value = pRemoteCharacteristic->readValue(); | ||
| Serial.print("Client: Initial characteristic value: "); | ||
| Serial.println(value.c_str()); | ||
| } | ||
|
|
||
| // Register for notifications if available | ||
| if (pRemoteCharacteristic->canNotify()) { | ||
| pRemoteCharacteristic->registerForNotify(notifyCallback); | ||
| Serial.println("Client: Registered for notifications"); | ||
| } | ||
|
|
||
| return true; | ||
| } | ||
|
|
||
| void setupServer() { | ||
| Serial.println("Setting up BLE Server..."); | ||
|
|
||
| // Create server | ||
| pServer = BLEDevice::createServer(); | ||
| pServer->setCallbacks(new ServerCallbacks()); | ||
|
|
||
| // Create service | ||
| BLEService *pService = pServer->createService(SERVER_SERVICE_UUID); | ||
|
|
||
| // Create characteristic | ||
| pServerCharacteristic = pService->createCharacteristic( | ||
| SERVER_CHARACTERISTIC_UUID, BLECharacteristic::PROPERTY_READ | BLECharacteristic::PROPERTY_WRITE | BLECharacteristic::PROPERTY_NOTIFY | ||
| ); | ||
|
|
||
| pServerCharacteristic->setCallbacks(new CharacteristicCallbacks()); | ||
| pServerCharacteristic->setValue("Hello from Coexistence Server"); | ||
|
|
||
| // Start service | ||
| pService->start(); | ||
|
|
||
| // Start advertising | ||
| BLEAdvertising *pAdvertising = BLEDevice::getAdvertising(); | ||
| pAdvertising->addServiceUUID(SERVER_SERVICE_UUID); | ||
| pAdvertising->setScanResponse(true); | ||
| pAdvertising->setMinPreferred(0x06); | ||
| pAdvertising->setMinPreferred(0x12); | ||
|
|
||
| BLEDevice::startAdvertising(); | ||
|
|
||
| Serial.println("Server: Advertising started"); | ||
| } | ||
|
|
||
| void setupClient() { | ||
| Serial.println("Setting up BLE Client..."); | ||
|
|
||
| // Create scanner | ||
| pBLEScan = BLEDevice::getScan(); | ||
| pBLEScan->setAdvertisedDeviceCallbacks(new AdvertisedDeviceCallbacks()); | ||
| pBLEScan->setActiveScan(true); | ||
| pBLEScan->setInterval(100); | ||
| pBLEScan->setWindow(99); | ||
|
|
||
| Serial.println("Client: Scanner configured"); | ||
| } | ||
|
|
||
| void setup() { | ||
| Serial.begin(115200); | ||
| Serial.println("Starting BLE Client-Server Coexistence Example..."); | ||
|
|
||
| // Initialize BLE device with a name | ||
| BLEDevice::init("ESP32-Coexistence"); | ||
|
|
||
| // Setup both server and client | ||
| setupServer(); | ||
| setupClient(); | ||
|
|
||
| // Start initial scan | ||
| pBLEScan->start(10, false); // Scan for 10 seconds, don't repeat | ||
|
|
||
| Serial.println("Setup complete. Device is advertising as server and scanning as client."); | ||
| } | ||
|
|
||
| void loop() { | ||
| static unsigned long lastServerUpdate = 0; | ||
| static unsigned long lastClientWrite = 0; | ||
| static unsigned long lastScanStart = 0; | ||
| unsigned long currentTime = millis(); | ||
|
|
||
| // Handle client connection attempts | ||
| if (doConnect && !clientConnected) { | ||
| if (connectToServer()) { | ||
| Serial.println("Client: Successfully connected to remote server"); | ||
| } else { | ||
| Serial.println("Client: Failed to connect, will retry scanning"); | ||
| // Restart scanning after failed connection | ||
| pBLEScan->start(10, false); | ||
| } | ||
| doConnect = false; | ||
| } | ||
|
|
||
| // Update server characteristic periodically | ||
| if (currentTime - lastServerUpdate > 5000) { // Every 5 seconds | ||
| String value = "Server time: " + String(millis() / 1000); | ||
| pServerCharacteristic->setValue(value.c_str()); | ||
| pServerCharacteristic->notify(); // Notify connected clients | ||
| Serial.print("Server: Updated characteristic to: "); | ||
| Serial.println(value); | ||
|
|
||
| lastServerUpdate = currentTime; | ||
| } | ||
|
|
||
| // Write to remote characteristic if connected as client | ||
| if (clientConnected && pRemoteCharacteristic && currentTime - lastClientWrite > 3000) { | ||
| if (pRemoteCharacteristic->canWrite()) { | ||
| String clientValue = "Client msg: " + String(millis() / 1000); | ||
| pRemoteCharacteristic->writeValue(clientValue.c_str(), clientValue.length()); | ||
| Serial.print("Client: Wrote to remote characteristic: "); | ||
| Serial.println(clientValue); | ||
| lastClientWrite = currentTime; | ||
| } | ||
| } | ||
|
|
||
| // Restart scanning periodically if not connected | ||
| if (!clientConnected && currentTime - lastScanStart > 15000) { // Every 15 seconds | ||
| Serial.println("Client: Restarting scan..."); | ||
| pBLEScan->start(10, false); | ||
| lastScanStart = currentTime; | ||
| } | ||
|
|
||
| delay(100); | ||
| } |
This file contains hidden or bidirectional Unicode text that may be interpreted or compiled differently than what appears below. To review, open the file in an editor that reveals hidden Unicode characters.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,5 @@ | ||
| fqbn_append: PartitionScheme=huge_app | ||
|
|
||
| requires_any: | ||
| - CONFIG_SOC_BLE_SUPPORTED=y | ||
| - CONFIG_ESP_HOSTED_ENABLE_BT_NIMBLE=y |
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