[Rc Car - Bluetooth App] Error Bluetooth Characteristic - Nano 33 IoT

Hello everyone,

I'm developing a RC car project using an Arduino Nano 33 ioT and an Android app for Bluetooth command.

I'm using the BLE RC Car application (https://play.google.com/store/apps/details?id=arduino.ble.co.andi.blearduinocar&gl=ES) but each time I press a button I get the following error:

characteristic_error_bluetooth_app1920×864 174 KB

I took as reference the following project to implement my code: https://docs.arduino.cc/tutorials/nano-33-iot/Bluetooth.

My code is:

/*ANDROID ARDUINO BLUETOOTH RC CAR */ #include <ArduinoBLE.h> //#include <Arduino_LSM6DS3.h> //IMU library int outPin1 = 2; //motor1 int outPin2 = 3; //motor1 int outPin4 = 6; //motor2 int outPin3 = 7; //motor2 char bt = 0; //BT BLEService moveService("180A"); // BLE Moving Service BLECharCharacteristic moveCharacteristic("2A57", BLERead | BLEWrite); /*----------------------------------------------------------*/ void setup() { Serial.begin(9600); pinMode(outPin1,OUTPUT); pinMode(outPin2,OUTPUT); pinMode(outPin3,OUTPUT); pinMode(outPin4,OUTPUT); pinMode(LED_BUILTIN, OUTPUT); // begin initialization if (!BLE.begin()) { Serial.println("starting BLE failed!"); while (1); } // set advertised local name and service UUID: BLE.setLocalName("Nano 33 IoT"); BLE.setAdvertisedService(moveService); // add the characteristic to the service moveService.addCharacteristic(moveCharacteristic); // add service BLE.addService(moveService); // set the initial value for the characteristic: moveCharacteristic.writeValue(0); // start advertising BLE.advertise(); } void loop() { BLEDevice central = BLE.central(); // if a central is connected to peripheral: if (central) { Serial.print("Connected to central: "); // print the central's MAC address: Serial.println(central.address()); // while the central is still connected to peripheral: while (central.connected()) { // if the remote device wrote to the characteristic, // use the value to control the car: if (moveCharacteristic.written()) { bt=moveCharacteristic.value(); /*___________________________________________________*/ if(bt == 'F') //move forwards { digitalWrite(outPin1,HIGH); digitalWrite(outPin2,LOW); digitalWrite(outPin3,HIGH); digitalWrite(outPin4,LOW); } else if (bt == 'B') //move backwards { digitalWrite(outPin1,LOW); digitalWrite(outPin2,HIGH); digitalWrite(outPin3,LOW); digitalWrite(outPin4,HIGH); } else if (bt == 'S') //stop!! { digitalWrite(outPin1,LOW); digitalWrite(outPin2,LOW); digitalWrite(outPin3,LOW); digitalWrite(outPin4,LOW); } else if (bt == 'R') //right { digitalWrite(outPin1,HIGH); digitalWrite(outPin2,LOW); digitalWrite(outPin3,LOW); digitalWrite(outPin4,LOW); } else if (bt == 'L') //left { digitalWrite(outPin1,LOW); digitalWrite(outPin2,LOW); digitalWrite(outPin3,HIGH); digitalWrite(outPin4,LOW); } else if (bt == 'I') //forward right { digitalWrite(outPin1,HIGH); digitalWrite(outPin2,LOW); digitalWrite(outPin3,LOW); digitalWrite(outPin4,HIGH); } else if (bt == 'G') //forward left { digitalWrite(outPin1,LOW); digitalWrite(outPin2,HIGH); digitalWrite(outPin3,HIGH); digitalWrite(outPin4,LOW); }//arduino// } } } Serial.print(F("Disconnected from central: ")); Serial.println(central.address()); digitalWrite(LED_BUILTIN, LOW); } /*----------- E N D -----------*/

I don't know which values I've to set to the service and characteristic identifiers to fix the error I'm having. This week I contacted the developers of the app I'm using to communicate them my problem to try to get some help but I haven't get an answer yet.

I hope someone can give me any clue to how I can fix this problem.

Thank you.