The argument type 'List<int>' can't be assigned to the parameter type 'Uint8List'

Question

Im using this code to send data via bluetooth with flutter and i have two questions.

First of all I am getting this error message which I dont know how to fix, the erros is this:

"The argument type 'List' can't be assigned to the parameter type 'Uint8List'".

here is the code:

void _sendMessage(String value1) async {
    value1 = value1.trim();
    if(value1.length >0){
      try{
        connection.output.add(utf8.encode(value1));
        await connection.output.allSent;
      }catch(e){
        setState(() { });


      }
    }
  }

the compiler highlights utf8.encode(value1) as the error

My second question is how i can alter this code to send integers instead of string

Answer 1

somethin like this init

  //send string
  void _sendMessageString(String value1) async {
    value1 = value1.trim();
    if (value1.length > 0) {
      try {
        List<int> list = value1.codeUnits;
        Uint8List bytes = Uint8List.fromList(list);
        connection.output.add(bytes);
        await connection.output.allSent;
      } catch (e) {
        setState(() {});
      }
    }
  }
  

  //send int
  void _sendMessageInt(int value1) async {
    try {
      Uint8List bytes = Uint8List(value1);
      connection.output.add(bytes);
      await connection.output.allSent;
    } catch (e) {
      setState(() {});
    }
  }