screen-sign-class

import SerialPort from 'serialport';

class Sign {
  static hexEncode(string) {
    const result = [];
    for (let i = 0; i < string.length; i++) {
      const hex = string.charCodeAt(i).toString(16);
      result.push(('00x' + hex).slice(-4));
    }
    return result;
  }

  constructor() {
    const tty = process.env.NODE_COMM || 'COM1';
    this.serialPort = new SerialPort(tty, {
      baudRate: 2400,
      dataBits: 7,
      stopBits: 2,
      parity: 'even',
      rtscts: false,
      xon: false,
      xoff: false,
      xany: false,
    });

    this.modes = {
      rotate: 0x61,
      hold: 0x62,
      flash: 0x63,
    };

    this.transmissionHeader = [0x00, 0x00, 0x00, 0x00, 0x00, 0x01, 0x5a, 0x30, 0x30, 0x02, 0x41, 0x41];
    //this.transmissionHeaderModes = [0x1B, 0x20, 0x61];
    this.trasmissionEnd = [0x04];
    console.log('serial port is set up');
  }


  writeMessage(message, mode) {
    console.log(message, mode);
    const text = Sign.hexEncode(message);
    const transmissionHeaderModes = [0x1B, 0x20, this.modes[mode]];
    const buffer = new Buffer.from(this.transmissionHeader.concat(transmissionHeaderModes, text, this.trasmissionEnd));
    this.serialPort.write(buffer);
    return true;
  }
}

export default Sign;