private void begin () {
		long t__send, dt;
		double rate;
		_t_send = System.currentTimeMillis();
		while (++times <= Utils.MAX) {
			broadcast("TEST", String.format("%d", System.currentTimeMillis()));
			if (times % Utils.STEP == 0) {
				t__send = System.currentTimeMillis();
				dt = t__send - _t_send;
				if (dt > 0)
					rate = (double) (Utils.STEP * 1000) / (double) dt;
				else
					rate = 0.0;
				Utils.out(pid, String.format("[SEND] %06d\trate %10.1f m/s", times, rate));
				_t_send = t__send;
			}
		}
	}