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June 30, 2020 09:20
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Read Xiaomi Mijia temperature and humidity sensor 2 (LYWSD03MMC) from ESP32
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| #include <Arduino.h> | |
| #include <BLEDevice.h> | |
| BLEClient *pClient; | |
| BLEScan *pBLEScan; | |
| #define SCAN_TIME 10 // seconds | |
| bool connected = false; | |
| #undef CONFIG_BTC_TASK_STACK_SIZE | |
| #define CONFIG_BTC_TASK_STACK_SIZE 32768 | |
| // The remote service we wish to connect to. | |
| static BLEUUID serviceUUID("ebe0ccb0-7a0a-4b0c-8a1a-6ff2997da3a6"); | |
| // The characteristic of the remote service we are interested in. | |
| static BLEUUID charUUID("ebe0ccc1-7a0a-4b0c-8a1a-6ff2997da3a6"); | |
| class MyClientCallback : public BLEClientCallbacks | |
| { | |
| void onConnect(BLEClient *pclient) | |
| { | |
| connected = true; | |
| Serial.printf(" * Connected %s\n", pclient->getPeerAddress().toString().c_str()); | |
| } | |
| void onDisconnect(BLEClient *pclient) | |
| { | |
| connected = false; | |
| Serial.printf(" * Disconnected %s\n", pclient->getPeerAddress().toString().c_str()); | |
| } | |
| }; | |
| static void notifyCallback( | |
| BLERemoteCharacteristic *pBLERemoteCharacteristic, | |
| uint8_t *pData, | |
| size_t length, | |
| bool isNotify) | |
| { | |
| float temp; | |
| float humi; | |
| float voltage; | |
| Serial.print(" + Notify callback for characteristic "); | |
| Serial.println(pBLERemoteCharacteristic->getUUID().toString().c_str()); | |
| temp = (pData[0] | (pData[1] << 8)) * 0.01; //little endian | |
| humi = pData[2]; | |
| voltage = (pData[3] | (pData[4] << 8)) * 0.001; //little endian | |
| Serial.printf("temp = %.1f C ; humidity = %.1f %% ; voltage = %.3f V\n", temp, humi, voltage); | |
| pClient->disconnect(); | |
| } | |
| void registerNotification() | |
| { | |
| if (!connected) | |
| { | |
| Serial.println(" - Premature disconnection"); | |
| return; | |
| } | |
| // Obtain a reference to the service we are after in the remote BLE server. | |
| BLERemoteService *pRemoteService = pClient->getService(serviceUUID); | |
| if (pRemoteService == nullptr) | |
| { | |
| Serial.print(" - Failed to find our service UUID: "); | |
| Serial.println(serviceUUID.toString().c_str()); | |
| pClient->disconnect(); | |
| } | |
| Serial.println(" + Found our service"); | |
| // Obtain a reference to the characteristic in the service of the remote BLE server. | |
| BLERemoteCharacteristic *pRemoteCharacteristic = pRemoteService->getCharacteristic(charUUID); | |
| if (pRemoteCharacteristic == nullptr) | |
| { | |
| Serial.print(" - Failed to find our characteristic UUID: "); | |
| Serial.println(charUUID.toString().c_str()); | |
| pClient->disconnect(); | |
| } | |
| Serial.println(" + Found our characteristic"); | |
| pRemoteCharacteristic->registerForNotify(notifyCallback); | |
| } | |
| void createBleClientWithCallbacks() | |
| { | |
| pClient = BLEDevice::createClient(); | |
| pClient->setClientCallbacks(new MyClientCallback()); | |
| } | |
| void connectSensor(BLEAddress htSensorAddress) | |
| { | |
| pClient->connect(htSensorAddress); | |
| } | |
| void setup() | |
| { | |
| Serial.begin(115200); | |
| Serial.println("+ Starting MJ client..."); | |
| delay(500); | |
| BLEDevice::init("ESP32"); | |
| createBleClientWithCallbacks(); | |
| pBLEScan = BLEDevice::getScan(); //create new scan | |
| pBLEScan->setActiveScan(true); //active scan uses more power, but get results faster | |
| pBLEScan->setInterval(0x50); | |
| pBLEScan->setWindow(0x30); | |
| } | |
| std::string addresses[10]; | |
| int addressCount = 0; | |
| void loop() | |
| { | |
| delay(500); | |
| BLEScanResults foundDevices = pBLEScan->start(SCAN_TIME); | |
| int count = foundDevices.getCount(); | |
| Serial.printf("+ Found device count : %d\n", count); | |
| for (int i = 0; i < count; i++) | |
| { | |
| BLEAdvertisedDevice b = foundDevices.getDevice(i); | |
| Serial.println(b.toString().c_str()); | |
| if (!b.getName().compare("LYWSD03MMC")) | |
| { | |
| BLEAddress addr = b.getAddress(); | |
| addresses[addressCount] = addr.toString(); | |
| addressCount++; | |
| } | |
| } | |
| for (int i = 0; i < addressCount; i++) | |
| { | |
| std::string curAddr = addresses[i]; | |
| bool found = false; | |
| for (int j = 0; j < count; j++) | |
| { | |
| if (foundDevices.getDevice(j).getAddress().equals(BLEAddress(curAddr))) | |
| { | |
| found = true; | |
| } | |
| } | |
| if (!found) | |
| { | |
| Serial.printf("* Remove offline address : %s\n", curAddr.c_str()); | |
| for (int j = addressCount; j > max(i, 1); j--) | |
| { | |
| addresses[j - 1] = addresses[j]; | |
| } | |
| continue; | |
| } | |
| Serial.printf("+ Connect : %s\n", curAddr.c_str()); | |
| connectSensor(BLEAddress(curAddr)); | |
| registerNotification(); | |
| while (connected) | |
| { | |
| delay(10); | |
| }; | |
| } | |
| delay(500); | |
| } | |
| // service data: 30585b05a5a4797938c1a408 |
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look at the variable addressCount - it is initialized at the end of setup; and adressCount++ in the loop -
but the variable is never reset back to zero. I think the variable should be reset to zero for each iteration of the loop...