sendPong method
Implementation
Future sendPong() async {
var pONGBODY = Uint8List(4);
var pONG = Uint8List(pONGBODY.length + 1);
pONGBODY[0] = 80;
pONGBODY[1] = 79;
pONGBODY[2] = 78;
pONGBODY[3] = 71;
pONG[0] = 0;
pONG.setRange(1, 4, pONGBODY);
channel!.send(pONG);
}