Created
May 28, 2023 05:54
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Experimental code to acquire data from SwitchBot Thermometer/Hygrometer by M5Stack.
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| #include <M5Stack.h> | |
| #include <BLEDevice.h> | |
| static BLEUUID SWITCHBOT_ServiceDataUUID( "0000fd3d-0000-1000-8000-00805f9b34fb" ); | |
| #define SWITCHBOT_CompanyID 0x0969 | |
| #define SWITCHBOT_DeviceType 'T' | |
| class MyAdvertisedDeviceCallbacks: public BLEAdvertisedDeviceCallbacks { | |
| void onResult(BLEAdvertisedDevice advertisedDevice) { | |
| Serial.print("BLE Advertised Device found: "); | |
| Serial.println(advertisedDevice.toString().c_str()); | |
| bool CompanyID_match = false; | |
| if ( advertisedDevice.haveManufacturerData() ) { | |
| std::string data = advertisedDevice.getManufacturerData(); | |
| if ( data.length() >= 2 ) { | |
| uint16_t CompanyID = data[0] | ( (uint16_t)data[1] << 8 ); | |
| if ( CompanyID == SWITCHBOT_CompanyID ) { | |
| CompanyID_match = true; | |
| } | |
| } | |
| } | |
| std::string ServiceData; | |
| bool ServiceDataUUID_match = false; | |
| if ( advertisedDevice.haveServiceData() ) { | |
| ServiceData = advertisedDevice.getServiceData(); | |
| if ( advertisedDevice.getServiceDataUUID().equals( SWITCHBOT_ServiceDataUUID ) ) { | |
| ServiceDataUUID_match = true; | |
| } | |
| } | |
| bool DeviceType_match = false; | |
| if ( ServiceDataUUID_match ) { | |
| if ( ServiceData[0] == SWITCHBOT_DeviceType ) { | |
| DeviceType_match = true; | |
| } | |
| } | |
| if ( CompanyID_match && ServiceDataUUID_match && DeviceType_match ) { | |
| uint8_t battery = ServiceData[2] & 0x7f; | |
| float temperature = ( ServiceData[4] & 0x7f ) + ( ServiceData[3] & 0x0f ) * 0.1F; | |
| if ( ( ServiceData[4] & 0x80 ) == 0 ) { | |
| temperature = -temperature; | |
| } | |
| uint8_t humidity = ServiceData[5] & 0x7f; | |
| Serial.println( "Found a meter!" ); | |
| BLEDevice::getScan()->stop(); | |
| M5.Lcd.println( "Found a meter!" ); | |
| M5.Lcd.print( "MAC: " ); | |
| M5.Lcd.println( advertisedDevice.getAddress().toString().c_str() ); | |
| M5.Lcd.print( "Temp: " ); | |
| M5.Lcd.println( temperature ); | |
| M5.Lcd.print( "Hum: " ); | |
| M5.Lcd.println( humidity ); | |
| M5.Lcd.print( "Batt: " ); | |
| M5.Lcd.println( battery ); | |
| } | |
| } | |
| }; | |
| void setup() { | |
| Serial.begin( 115200 ); | |
| M5.begin(); | |
| M5.Lcd.setTextSize( 2 ); | |
| M5.Lcd.println( "BLE scan start." ); | |
| BLEDevice::init( "" ); | |
| BLEScan* pBLEScan = BLEDevice::getScan(); | |
| pBLEScan->setAdvertisedDeviceCallbacks( new MyAdvertisedDeviceCallbacks( )); | |
| pBLEScan->setInterval( 510 ); | |
| pBLEScan->setWindow( 449 ); | |
| pBLEScan->setActiveScan( true ); | |
| pBLEScan->start( 5, false ); | |
| } | |
| void loop() { | |
| delay( 1000 ); | |
| } |
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