/*
 * Author: Stefan Andritoiu <stefan.andritoiu@intel.com>
 * Copyright (c) 2015 Intel Corporation.
 *
 * This program and the accompanying materials are made available under the
 * terms of the The MIT License which is available at
 * https://opensource.org/licenses/MIT.
 *
 * SPDX-License-Identifier: MIT
 */

//NOT TESTED!!!
public class HM11_Example {

	private static final int BUFSIZ = 1024;

	private static void printUsage() {
		System.out.println("Usage: java HM11_Example [AT command]");

		System.out.println("If an argument is supplied on the command line, that argument is");
		System.out.println("sent to the module and the response is printed out.");
		System.out.println("If no argument is used, then the address and PIN of the module");
		System.out.println("are queried and the results printed out.");

	}

	private static void sendCommand(upm_hm11.HM11 ble, byte[] cmd) {
		byte[] buffer = new byte[BUFSIZ];
		ble.writeData(cmd);

		// wait up to 1 second
		if (ble.dataAvailable(1000)) {
			ble.readData(buffer);
		} else {
			System.err.println("Timed out waiting for response");
		}

	}

	public static void main(String[] args) throws InterruptedException {
		// ! [Interesting]
		// Instantiate a HM11 BLE Module on UART 0
		upm_hm11.HM11 ble = new upm_hm11.HM11(0);

		// make sure port is initialized properly. 9600 baud is the default.
		if (!ble.setupTty()) {
			System.err.println("Failed to setup tty port parameters");
			System.exit(-1);
		}

		printUsage();

		if (args.length > 0) {
			System.out.println("Sending command line argument (" + args[0] + ")...");
			sendCommand(ble, args[0].getBytes());
		} else {
			// query the module address
			String addr = "AT+ADDR?";
			System.out.println("Querying module address (" + addr + ")...");
			sendCommand(ble, addr.getBytes());

			Thread.sleep(1000);

			// query the module address
			String pin = "AT+PASS?";
			System.out.println("Querying module pin (" + pin + ")...");
			sendCommand(ble, pin.getBytes());

			// Other potentially useful commands are:
			//
			// AT+VERS? - query module version
			// AT+ROLE0 - set as slave
			// AT+ROLE1 - set as master
			// AT+CLEAR - clear all previous settings
			// AT+RESET - restart the device
			//
			// A comprehensive list is available from the datasheet at:
			// http://www.seeedstudio.com/wiki/images/c/cd/Bluetooth4_en.pdf

		}
		// ! [Interesting]
	}
}