cómo enviar el código de verificación usando el ejemplo de código de aleteo de firebase

Luego de consultar con expertos en esta materia, programadores de deferentes áreas y maestros hemos dado con la respuesta al problema y la plasmamos en esta publicación.

Ejemplo: navegación automática a la pantalla de inicio después de iniciar sesión en otp flutter

class SignUpView extends StatefulWidget 
  @override
  _SignUpViewState createState() => _SignUpViewState();


class _SignUpViewState extends State 

  final formKey = new GlobalKey();

  String phoneNo, verificationId, smsCode;

  bool codeSent = false;

  @override
  Widget build(BuildContext context) 
    return Scaffold(
      body: Form(
        key: formKey,
        child: Column(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Padding(
              padding: EdgeInsets.only(left: 25, right: 25),
              child: TextFormField(
                keyboardType: TextInputType.phone,
                decoration: InputDecoration(hintText: "Enter Phone Number"),

                onChanged: (val) 
                  setState(() 
                    this.phoneNo = val;
                  );
                ,
              ),
            ),


           codeSent ? Padding(
              padding: EdgeInsets.only(left: 25, right: 25),
              child: TextFormField(
                keyboardType: TextInputType.phone,
                decoration: InputDecoration(hintText: "Enter OTP"),

                onChanged: (val) 
                  setState(() 
                    this.smsCode = val;
                  );
                ,
              ),
           ): Container(),




            Padding(
              padding: EdgeInsets.only(left: 25, right: 25),
              child: RaisedButton(
                child: Center(
                  child: codeSent ? Text("Login") : Text("Login"),
                ),
                onPressed: () 
                  codeSent? AuthService().signInWithOTP(smsCode, verificationId):verifyPhone(phoneNo);
                  ,
              ),
            ),

          ],
        ),
      ),
    );
  

  Future verifyPhone(phoneNo) async 
    final PhoneVerificationCompleted verified = (AuthCredential authResult) 
      AuthService().signIn(authResult);
    ;

    final PhoneVerificationFailed verificationFailed = (
        AuthException authException) 
      print('$authException.message');
    ;

    final PhoneCodeSent smsSent = (String verId, [int forceResend]) 
      this.verificationId = verId;
      setState(() 
        this.codeSent = true;
      );
    ;

    final PhoneCodeAutoRetrievalTimeout autoTimeOut = (String verId) 
      this.verificationId = verId;
    ;


    await FirebaseAuth.instance.verifyPhoneNumber(
        phoneNumber: phoneNo,
        timeout: const Duration(seconds: 5),
        verificationCompleted: verified,
        verificationFailed: verificationFailed,
        codeSent: smsSent,
        codeAutoRetrievalTimeout: autoTimeOut);
  

Recuerda algo, que tienes permiso de decir si topaste tu inconveniente a tiempo.

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