Flutter : external barcode scanner continuous

I am developing a flutter application with below process

1. scan number (external Bluetooth barcode scanner)
2. upload barcode data
3. repeat 1,2 step c

I could able to scan and upload the first data. then I cleared the text. but i could not place the cursor at the _text controller.

I dont want to press the text field every time before scan the textfield.

TextField(
                controller: _text,
                  textInputAction: TextInputAction.go,
                onSubmitted: (value) {
                  print(submit online using function");
                  _text.clear();
                  _text.selection= TextSelection.collapsed(offset: -1);

                },
                decoration: const InputDecoration(
                  icon: Icon(Icons.person),
                  hintText: 'Enter ID',
                  labelText: 'Enter ID',
                ),
                autofocus: true,
                keyboardType: TextInputType.number,
                inputFormatters: <TextInputFormatter>[
                  WhitelistingTextInputFormatter.digitsOnly
                ],
              ),

   TextFormField(
          enabled: true,
          autofocus: true,
          autocorrect: false,
          textInputAction: TextInputAction.done,
          keyboardType: TextInputType.text,
          focusNode: focusBarCode,
          onFieldSubmitted: (val) {
            print(val); // the scan value
            //process the val
            barCodecontroller.text =""; // set to blank again
            focusBarCode.requestFocus();//set focus again, so u can 
                                        //scan again
       `enter code here`},
       controller: barCodecontroller,
    ),