flutter_serial 0.0.3

This Plugin uses c library and java on the android side for serial communication

Flutter Serial!

An Android Plugin for Serial Communication which allow you to read and write the data through the available ports The supported features are:

• Listing the available serial ports on the device, including USB to serial adapters
• Configuring serial ports (baud rate, input type)
• Providing standard InputStream and OutputStream

Description

This PlugIn enables the communication with the USB RS232 RS485 UART

Supported platforms:

• Android :arm65-v8a, armeabi,armeabi-v7a,mips,mips64,x86,x86_64

Connection Setup

• User Interface is connected to rs232 converter which sending data to machine receiving the data(You can use any Serial data receiving software for testing purposes.I have used Realterm : Serial Capture Program that is available for windows)
• USB-A to micro USB cable used in the image to connect Commercial Android intelligent display terminal running Android 11 operating system with laptop for debugging purposes only.

Features

• Doesn't require root in Android
• Easy to use
• Using listener for reading message

Add a dependency to your pubspec.yaml

dependencies:
	flutter_serial: latest_version

include the usbserial package at the top of your dart file.

import  'package:flutter_serial/flutter_serial.dart';

❓ Usage

If you encounter any issues please refer to the API docs and the sample code in the example directory.

The example directory has a sample application that demonstrates the features of this plugin.

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🔧 Android Setup

Initialisation
The first step is to call the startSerial() method and subscribe the StreamSubscription

Start Serial

startSerial method will open the transaction stream

FlutterSerial flutterSerial = FlutterSerial();

  @override
  void initState() {
    super.initState();
   flutterSerial.startSerial().listen(_updateConnectionStatus);
    getSerialList();
  }
  
 void  _updateConnectionStatus(SerialResponse? result) async {
logData = result!.logChannel ?? "";
receivedData = result.readChannel ?? "";
});
}

By calling the startSerial() it will provide you with the SerialResponse in the form of stream data

SerialResponse In Serial Response you will get the following type

1. Log Channel (type:String)

2. Read Channel (type:String)

3. Log Channel: In the log channel you wll get the repsone when you open any port ,close any port , transmit data (TX).

4. Read Channel: In the Read channel you wll get the Recived data (RX)

Available Ports

The getAvailablePorts() method will return you all the
available ports on a device

serialList = await  flutterSerial.getAvailablePorts();

Open

openPort method will open the serial communication Its has 3 required parameter { DataFormat dataFormat, String serialPort, int baudRate }

flutterSerial.openPort(
dataFormat: DataFormat.ASCII,
serialPort: serialList.first,
baudRate: flutterSerial.baudRateList.first)

Close

closePort method will close the port if you have opened any port

flutterSerial.closePort();

Send Command

sendCommand method will send your message Its has 1 required parameter {String message}

flutterSerial.sendCommand(message: "message");

Clear

clearLog method will clear the Log channel clearRead method will clear the Read channel

flutterSerial.clearLog();
flutterSerial.clearRead();

Destroy

destroy method will eliminate the resources

@override
void  dispose() {
flutterSerial.destroy();
super.dispose();
}

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• Baud Rate To get the Standard baud rates list call the FlutterSerial().baudRateList it will return the integer list of standard baud rate

• Data Format The Data format is used to convert the data type To pass the data format in the open() method parameter For ascii format call the DataFormat.ASCII

  For hex_String format call the DataFormat.HEX_STRING