self.set_syncword(self._last_syncword, submit_queue = None, force = True)
		self._apply_packet_format_config(self._last_format_config)

	def set_channel(self, channel):
		state = self.get_register_bits('radio_state')
		state['channel'] = channel

		self.put_register_bits('radio_state', state, delay = 130)

		return state

	def set_syncword(self, syncword, force = False, submit_queue = '__DEFAULT__'):
		# If queuing is being used, just store this message
		if submit_queue is not None and self._should_use_queue():
			self._enqueue(submit_queue, syncword, None, None, post_delay = 0)

		with self._get_mutex(lock):
			# Set the syncword
			if syncword is not None:
				self.set_syncword(syncword, submit_queue = None)

			# Apply any format changes
			radio_format_config = self._apply_packet_format_config(format_config)
			self._debug("Radio format_config = {}".format(radio_format_config))

			# Determine if the length should be included
			if radio_format_config['packet_length_encoded'] == 1:
				include_length = True
			else:
				include_length = False

	def multi_transmit(self, message, channels, retries = 3, delay = 0.1, syncword = None, submit_queue = '__DEFAULT__', format_config = None):
		if len(channels) == 0 or retries == 0:
			self._error("Asked to send the message {} a total of zero times ({} channels, {} retries)".format(message, channels, retries))

		# Wait at-least 350 microseconds between frames
		min_delay = 350.0 / 1000000.0
		retry_delay = delay / retries
		post_delay = max(min_delay, retry_delay)
		final_delay = delay

		for channel_idx in range(len(channels)):
			if channel_idx == (len(channels) - 1):
				retries -= 1
			channel = channels[channel_idx]
			for i in range(retries):
				if not self.transmit(message, channel, post_delay = post_delay, syncword = syncword, submit_queue = submit_queue, format_config = format_config):
					return False
		if not self.transmit(message, channel, post_delay = final_delay, syncword = syncword, submit_queue = submit_queue, format_config = format_config):
			return False

		return True

	def _enqueue(self, submit_queue, syncword, message, channel, post_delay = 0, format_config = None):

					self._debug("Found {} items to transmit in the {} queue".format(pop_items, submit_queue))
				while pop_items != 0:
					to_transmit.append(self._software_tx_queue[submit_queue].popleft())
					pop_items -= 1

				remaining_items += len(self._software_tx_queue[submit_queue])

		to_transmit_ordered = {}
		default_syncword = None



		for item in to_transmit:

			syncword = item['syncword']

			channel = item['channel']
			format_config = item['format_config']
			message = item['message']

			if syncword is not None:
				default_syncword = syncword
			else:
				syncword = default_syncword
				item['syncword'] = syncword

			if message is None or channel is None:
				continue

			key = str([syncword, channel])

			if key not in to_transmit_ordered:
				to_transmit_ordered[key] = []

			to_transmit_ordered[key].append(item)

		self._debug("Getting ready to transmit {} items".format(len(to_transmit)))
		with self._get_mutex():
			for (key, items) in to_transmit_ordered.items():
				for item in items:
					self._debug("Transmitting item {}".format(item))
					syncword = item['syncword']
					channel = item['channel']
					format_config = item['format_config']
					message = item['message']

					self.transmit(message, channel, lock = False, submit_queue = None, syncword = syncword, post_delay = 0, format_config = format_config)
					self._software_tx_queue_next_time[item['submit_queue']] = time.time() + item['post_delay']

		return [len(to_transmit), remaining_items]
		
	def start_listening(self, channel):
		# Initialize the receiver
		self.stop_listening()