Hello, super sketch! I have already solved the problem with the wrong values. Since I read 12 sensors, a better naming in Mqtt would be an advantage. I did that too, but now the battery only has strange drawings in MQTT. Does anyone have a solution?

`/** A BLE client for the Xiaomi Mi Plant Sensor, pushing measurements to an MQTT server.

See https://github.com/nkolban/esp32-snippets/blob/master/Documentation/BLE%20C%2B%2B%20Guide.pdf on how bluetooth low energy and the library used are working.

See https://github.com/ChrisScheffler/miflora/wiki/The-Basics for details on how the protocol is working.

MIT License

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */

include "BLEDevice.h"

include

include "config.h"

// boot count used to check if battery status should be read RTC_DATA_ATTR int bootCount = 0;

char* deviceName;// //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

// device count static int deviceCount = sizeof FLORA_DEVICES / sizeof FLORA_DEVICES[0];

// the remote service we wish to connect to static BLEUUID serviceUUID("00001204-0000-1000-8000-00805f9b34fb");

// the characteristic of the remote service we are interested in static BLEUUID uuid_version_battery("00001a02-0000-1000-8000-00805f9b34fb"); static BLEUUID uuid_sensor_data("00001a01-0000-1000-8000-00805f9b34fb"); static BLEUUID uuid_write_mode("00001a00-0000-1000-8000-00805f9b34fb");

TaskHandle_t hibernateTaskHandle = NULL;

WiFiClient espClient; PubSubClient client(espClient);

void connectWifi() { Serial.println("Connecting to WiFi..."); WiFi.begin(WIFI_SSID, WIFI_PASSWORD);

while (WiFi.status() != WL_CONNECTED) { delay(500); Serial.print("."); }

Serial.println(""); Serial.println("WiFi connected"); Serial.println(""); }

void disconnectWifi() { WiFi.disconnect(true); Serial.println("WiFi disonnected"); }

void connectMqtt() { Serial.println("Connecting to MQTT..."); client.setServer(MQTT_HOST, MQTT_PORT);

while (!client.connected()) { if (!client.connect(MQTT_CLIENTID, MQTT_USERNAME, MQTT_PASSWORD)) { Serial.print("MQTT connection failed:"); Serial.print(client.state()); Serial.println("Retrying..."); delay(MQTT_RETRY_WAIT); } }

Serial.println("MQTT connected"); Serial.println(""); }

void disconnectMqtt() { client.disconnect(); Serial.println("MQTT disconnected"); }

BLEClient getFloraClient(BLEAddress floraAddress) { BLEClient floraClient = BLEDevice::createClient();

if (!floraClient->connect(floraAddress)) { Serial.println("- Connection failed, skipping"); return nullptr; }

Serial.println("- Connection successful"); return floraClient; }

BLERemoteService getFloraService(BLEClient floraClient) { BLERemoteService* floraService = nullptr;

try { floraService = floraClient->getService(serviceUUID); } catch (...) { // something went wrong } if (floraService == nullptr) { Serial.println("- Failed to find data service"); } else { Serial.println("- Found data service"); }

return floraService; }

bool forceFloraServiceDataMode(BLERemoteService floraService) { BLERemoteCharacteristic floraCharacteristic;

// get device mode characteristic, needs to be changed to read data Serial.println("- Force device in data mode"); floraCharacteristic = nullptr; try { floraCharacteristic = floraService->getCharacteristic(uuid_write_mode); } catch (...) { // something went wrong } if (floraCharacteristic == nullptr) { Serial.println("-- Failed, skipping device"); return false; }

// write the magic data uint8_t buf[2] = {0xA0, 0x1F}; floraCharacteristic->writeValue(buf, 2, true);

delay(500); return true; }

bool readFloraDataCharacteristic(BLERemoteService floraService, String baseTopic) { BLERemoteCharacteristic floraCharacteristic = nullptr;

// get the main device data characteristic Serial.println("- Access characteristic from device"); try { floraCharacteristic = floraService->getCharacteristic(uuid_sensor_data); } catch (...) { // something went wrong } if (floraCharacteristic == nullptr) { Serial.println("-- Failed, skipping device"); return false; }

// read characteristic value Serial.println("- Read value from characteristic"); std::string value; try{ value = floraCharacteristic->readValue(); } catch (...) { // something went wrong Serial.println("-- Failed, skipping device"); return false; } const char *val = value.c_str();

Serial.print("Hex: "); for (int i = 0; i < 16; i++) { Serial.print((int)val[i], HEX); Serial.print(" "); } Serial.println(" ");

int16_t temp_raw = (int16_t)val; float temperature = (*temp_raw) / ((float)10.0); Serial.print("-- Temperature: "); Serial.println(temperature);

int moisture = val[7]; Serial.print("-- Moisture: "); Serial.println(moisture);

int light = val[3] + val[4] * 256; Serial.print("-- Light: "); Serial.println(light);

int conductivity = val[8] + val[9] * 256; Serial.print("-- Conductivity: "); Serial.println(conductivity);

if (temperature > 200 || temperature < -30 || conductivity > 2000) { //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Serial.println("-- Unreasonable values received, skip publish"); return false; }

char buffer[64];

snprintf(buffer, 64, "%f", temperature); client.publish((baseTopic + "temperature").c_str(), buffer); snprintf(buffer, 64, "%d", moisture); client.publish((baseTopic + "moisture").c_str(), buffer); snprintf(buffer, 64, "%d", light); client.publish((baseTopic + "light").c_str(), buffer); snprintf(buffer, 64, "%d", conductivity); client.publish((baseTopic + "conductivity").c_str(), buffer);

return true; }

bool readFloraBatteryCharacteristic(BLERemoteService floraService, String baseTopic) { BLERemoteCharacteristic floraCharacteristic = nullptr;

// get the device battery characteristic Serial.println("- Access battery characteristic from device"); try { floraCharacteristic = floraService->getCharacteristic(uuid_version_battery); } catch (...) { // something went wrong } if (floraCharacteristic == nullptr) { Serial.println("-- Failed, skipping battery level"); return false; }

// read characteristic value Serial.println("- Read value from characteristic"); std::string value; try{ value = floraCharacteristic->readValue(); } catch (...) { // something went wrong Serial.println("-- Failed, skipping battery level"); return false; } const char *val2 = value.c_str(); int battery = val2[0];

char buffer[64];

Serial.print("-- Battery: "); Serial.println(battery); if (battery = 0 ) { //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ Serial.println("-- Unreasonable battery values received, skip publish"); return false;

snprintf(buffer, 64, "%d", battery); Serial.println(buffer); }

Serial.println("-- Batteriewert ist:");

client.publish((baseTopic + "battery").c_str(), buffer); return true; } //###############################################################################################################################################

bool processFloraService(BLERemoteService floraService, char deviceMacAddress, bool readBattery, char* deviceName) { // set device in data mode

if (!forceFloraServiceDataMode(floraService)) { return false; } // ################################################################################################################################################################# // String baseTopic = MQTT_BASE_TOPIC + "/" + deviceMacAddress + "/";

  String baseTopic = MQTT_BASE_TOPIC + "/" + deviceMacAddress +  "/" + deviceName + "/";

bool dataSuccess = readFloraDataCharacteristic(floraService, baseTopic);

bool batterySuccess = true; if (readBattery) { batterySuccess = readFloraBatteryCharacteristic(floraService, baseTopic); }

return dataSuccess && batterySuccess; }

bool processFloraDevice(BLEAddress floraAddress, char deviceMacAddress, bool getBattery, int tryCount, char deviceName) { Serial.print("Processing Flora device at " ); Serial.print (deviceName); Serial.print(floraAddress.toString().c_str()); Serial.print(" (try "); Serial.print(tryCount); Serial.println(")");

// connect to flora ble server BLEClient* floraClient = getFloraClient(floraAddress); if (floraClient == nullptr) { return false; }

// connect data service BLERemoteService* floraService = getFloraService(floraClient); if (floraService == nullptr) { floraClient->disconnect(); return false; }

// process devices data //*** bool success = processFloraService(floraService, deviceMacAddress, getBattery, deviceName ); // bool success = processFloraService(floraService, deviceMacAddress, getBattery); // disconnect from device floraClient->disconnect();

return success; }

void hibernate() { esp_sleep_enable_timer_wakeup(SLEEP_DURATION * 1000000ll); Serial.println("Going to sleep now."); delay(100); esp_deep_sleep_start(); }

void delayedHibernate(void parameter) { delay(EMERGENCY_HIBERNATE1000); // delay for five minutes Serial.println("Something got stuck, entering emergency hibernate..."); hibernate(); }

void setup() { // all action is done when device is woken up Serial.begin(115200); delay(1000);

// increase boot count bootCount++;

// create a hibernate task in case something gets stuck xTaskCreate(delayedHibernate, "hibernate", 4096, NULL, 1, &hibernateTaskHandle);

Serial.println("Initialize BLE client..."); BLEDevice::init(""); BLEDevice::setPower(ESP_PWR_LVL_P7);

// connecting wifi and mqtt server connectWifi(); connectMqtt();

// check if battery status should be read - based on boot count bool readBattery = ((bootCount % BATTERY_INTERVAL) == 0);

// process devices for (int i=0; i<deviceCount; i++) { int tryCount = 0; //**** char deviceMacAddress = FLORA_DEVICES[i]; char deviceName = FLORA_DEVICES_NAME[i]; //**** BLEAddress floraAddress(deviceMacAddress);

while (tryCount < RETRY) {
  tryCount++;
  if (processFloraDevice(floraAddress, deviceMacAddress, readBattery, tryCount, deviceName)) {
    break;
  }
  delay(1000);
}
delay(1500); // (vorher 1500)

} //delay(8500);//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ // disconnect wifi and mqtt (original war zuerst WIFI, dann MQTT)

disconnectMqtt(); delay(1500); // (vorher 0)

disconnectWifi(); delay(1500);

// delete emergency hibernate task vTaskDelete(hibernateTaskHandle);

// go to sleep now hibernate(); }

void loop() { /// we're not doing anything in the loop, only on device wakeup delay(10000); }`

and her the configuration:

` // array of different xiaomi flora MAC addresses char* FLORA_DEVICES[] = {"C4:7C:8D:66:CA:C2","c4:7c:8d:66:b1:fe"}; // FLORA_DEVICES_Adresses

char FLORA_DEVICES_NAME[] = {"FLORA_0","FLORA_1"}; // FLORA_DEVICES_Names //char deviceName;// //+++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++

// sleep between to runs in seconds

define SLEEP_DURATION 20

// emergency hibernate countdown in seconds

define EMERGENCY_HIBERNATE 60

// how often should the battery be read - in run count

define BATTERY_INTERVAL 6

// how often should a device be retried in a run when something fails

define RETRY 5

const char WIFI_SSID = "xxxxxxxxxxxxxxxxxxxxxxxxx"; const char WIFI_PASSWORD = "xxxxxxxxxxxxxxxxxxx";

// MQTT topic gets defined by "//" // where MAC_ADDRESS is one of the values from FLORA_DEVICES array // property is either temperature, moisture, conductivity, light or battery

const char MQTT_HOST = "192.168.178.85"; const int MQTT_PORT = 1883; const char MQTT_CLIENTID = "miflora"; const char MQTT_USERNAME = "xxxxxxxxxxxxxxx"; const char MQTT_PASSWORD = "xxxxxxxxxxxxxx"; const String MQTT_BASE_TOPIC = "flora"; const int MQTT_RETRY_WAIT = 5000;

sidddy / flora

Better label multiple devices #33

include "BLEDevice.h"

include

include

include "config.h"

define SLEEP_DURATION 20

define EMERGENCY_HIBERNATE 60

define BATTERY_INTERVAL 6

define RETRY 5