Method update

src/input/stream/Streamer.cpp:158–185

	}

	bool Streamer::update() {
		SI_LOG_INFO("Stream: %d, Updating frontend...", _streamID);
		if (_deviceData.hasDeviceDataChanged()) {
			_deviceData.resetDeviceDataChanged();
			_udpMultiListen.closeFD();
		}
		if (_udpMultiListen.getFD() == -1) {
			//  Open mutlicast stream
			const std::string multiAddr = _deviceData.getMultiAddr();
			const int port = _deviceData.getPort();
			if(initMutlicastUDPSocket(_udpMultiListen, multiAddr, _bindIPAddress, port)) {
				SI_LOG_INFO("Stream: %d, Streamer reading from: %s:%d  fd %d", _streamID,
					multiAddr.c_str(), port, _udpMultiListen.getFD());
				// set receive buffer to 8MB
				constexpr int bufferSize =  1024 * 1024 * 8;
				_udpMultiListen.setNetworkReceiveBufferSize(bufferSize);

				_pfd[0].events  = POLLIN | POLLHUP | POLLRDNORM | POLLERR;
				_pfd[0].revents = 0;
				_pfd[0].fd      = _udpMultiListen.getFD();

			} else {
				SI_LOG_ERROR("Stream: %d, Init UDP Multicast socket failed", _streamID);
			}
		}
		SI_LOG_DEBUG("Stream: %d, Updating frontend (Finished)", _streamID);
		return true;
	}

	bool Streamer::teardown() {
		_deviceData.initialize();