# -*- coding: UTF-8 -*- """ @author: DJ2LS HF mesh networking prototype and testing module import time MeshParam.routing_table = [['AA1AA', 'direct', 0, 1.0, 25, time.time(), ], ['AA1AA', 'AA2BB', 1, 3.1, 10, time.time(), ], ['AA3CC', 'AA2BB', 5, -4.5, -3, time.time(), ]] print(MeshParam.routing_table) print("---------------------------------") TODO: SIGNALLING FOR ACK/NACK: - mesh-signalling burst is datac13 - mesh-signalling frame contains [message id, status, hops, score, payload] - frame type is 1 byte - message id is 32bit crc --> 4bytes - status can be ACK, NACK, PING, PINGACK --> 1byte - payload = 14bytes - 8 bytes = 6bytes - create a list for signalling frames, contains [message id, message-status, attempts, state, timestamp] - on "IRS", send ACK/NACK 10 times on receiving beacon? - on "ROUTER", receive ACK/NACK, and store it in table, also send it 10 times - if sent 10 times, set ACK/NACK state to "done" - if done already in list, don't reset retry counter - delete ACK/NACK if "done" and timestamp older than 1day TODO: SCORE CALCULATION: SNR: negative --> * 2 """ # pylint: disable=invalid-name, line-too-long, c-extension-no-member # pylint: disable=import-outside-toplevel, attribute-defined-outside-init from static import TNC, MeshParam, FRAME_TYPE, Station, ModemParam, ARQ from codec2 import FREEDV_MODE import numpy as np import time import threading import modem import helpers import structlog import ujson as json from queues import MESH_RECEIVED_QUEUE, MESH_QUEUE_TRANSMIT, MESH_SIGNALLING_TABLE class MeshRouter(): def __init__(self): self.log = structlog.get_logger("RF") self.mesh_broadcasting_thread = threading.Thread( target=self.broadcast_routing_table, name="worker thread receive", daemon=True ) self.mesh_broadcasting_thread.start() self.mesh_rx_dispatcher_thread = threading.Thread( target=self.mesh_rx_dispatcher, name="worker thread receive", daemon=True ) self.mesh_rx_dispatcher_thread.start() self.mesh_tx_dispatcher_thread = threading.Thread( target=self.mesh_tx_dispatcher, name="worker thread receive", daemon=True ) self.mesh_tx_dispatcher_thread.start() self.mesh_signalling_dispatcher_thread = threading.Thread( target=self.mesh_signalling_dispatcher, name="worker thread receive", daemon=True ) self.mesh_signalling_dispatcher_thread.start() def get_from_heard_stations(self): """ get data from heard stations heard stations format: [dxcallsign,dxgrid,int(time.time()),datatype,snr,offset,frequency] TNC.heard_stations.append( [ dxcallsign, dxgrid, int(time.time()), datatype, snr, offset, frequency, ] ) """ dxcallsign_position = 0 dxgrid_position = 1 timestamp_position = 2 type_position = 3 snr_position = 4 offset_position = 5 frequency_position = 6 try: for item in TNC.heard_stations: print("-----------") print(item) print(item[snr_position]) try: print(item[snr_position]) snr = bytes(item[snr_position], "utf-8").split(b"/") snr = int(float(snr[0])) except Exception as err: snr = int(float(item[snr_position])) new_router = [helpers.get_crc_24(item[dxcallsign_position]), helpers.get_crc_24(b'direct'), 0, snr, self.calculate_score_by_snr(snr), item[timestamp_position]] self.add_router_to_routing_table(new_router) except Exception as e: self.log.warning("[MESH] error fetching data from heard station list", e=e) def add_router_to_routing_table(self, new_router): try: # destination callsign # router callsign # hops # rx snr # route quality # timestamp for _, item in enumerate(MeshParam.routing_table): # update routing entry if exists if new_router[0] in item[0] and new_router[1] in item[1]: print(f"UPDATE {MeshParam.routing_table[_]} >>> {new_router}") MeshParam.routing_table[_] = new_router # add new routing entry if not exists if new_router not in MeshParam.routing_table: print(f"INSERT {new_router} >>> ROUTING TABLE") MeshParam.routing_table.append(new_router) except Exception as e: self.log.warning("[MESH] error adding data to routing table", e=e, router=new_router) def broadcast_routing_table(self, interval=600): while True: # always enable receiving for datac4 if broadcasting modem.RECEIVE_DATAC4 = True threading.Event().wait(1) if MeshParam.enable_protocol and not ARQ.arq_state and not ModemParam.channel_busy: try: # wait some time until sending routing table threading.Event().wait(interval) # before we are transmitting, let us update our routing table self.get_from_heard_stations() #[b'DJ2LS-0', 'direct', 0, 9.6, 9.6, 1684912305] mesh_broadcast_frame_header = bytearray(4) mesh_broadcast_frame_header[:1] = bytes([FRAME_TYPE.MESH_BROADCAST.value]) mesh_broadcast_frame_header[1:4] = helpers.get_crc_24(Station.mycallsign) # callsign(6), router(6), hops(1), path_score(1) == 14 ==> 14 28 42 ==> 3 mesh routing entries # callsign_crc(3), router_crc(3), hops(1), path_score(1) == 8 --> 6 # callsign_crc(3), hops(1), path_score(1) == 5 --> 10 # Create a new bytearray with a fixed length of 50 result = bytearray(50) # Iterate over the route subarrays and add the selected entries to the result bytearray index = 0 for route_id, route in enumerate(MeshParam.routing_table): # the value 5 is the length of crc24 + hops + score dxcall = MeshParam.routing_table[route_id][0] # router = MeshParam.routing_table[i][1] hops = MeshParam.routing_table[route_id][2] # snr = MeshParam.routing_table[i][3] route_score = np.clip(MeshParam.routing_table[route_id][4], 0, 254) # timestamp = MeshParam.routing_table[i][5] result[index:index + 5] = dxcall + bytes([hops]) + bytes([route_score]) index += 5 # Split the result bytearray into a list of fixed-length bytearrays split_result = [result[i:i + 50] for i in range(0, len(result), 50)] frame_list = [] for _ in split_result: # make sure payload is always 50 _[len(_):] = bytes(50 - len(_)) #print(len(_)) frame_list.append(mesh_broadcast_frame_header + _) TNC.transmitting = True c2_mode = FREEDV_MODE.datac4.value self.log.info("[MESH] broadcasting routing table", frame_list=frame_list, frames=len(split_result)) modem.MODEM_TRANSMIT_QUEUE.put([c2_mode, 1, 0, frame_list]) # Wait while transmitting while TNC.transmitting: threading.Event().wait(0.01) except Exception as e: self.log.warning("[MESH] broadcasting routing table", e=e) def mesh_rx_dispatcher(self): while True: data_in = MESH_RECEIVED_QUEUE.get() if int.from_bytes(data_in[:1], "big") in [FRAME_TYPE.MESH_BROADCAST.value]: self.received_routing_table(data_in[:-2]) elif int.from_bytes(data_in[:1], "big") in [FRAME_TYPE.MESH_SIGNALLING_PING.value]: self.received_mesh_ping(data_in[:-2]) elif int.from_bytes(data_in[:1], "big") in [FRAME_TYPE.MESH_SIGNALLING_PING_ACK.value]: self.received_mesh_ping_ack(data_in[:-2]) else: print("wrong mesh data received") print(data_in) def mesh_tx_dispatcher(self): while True: data = MESH_QUEUE_TRANSMIT.get() print(data) if data[0] == "PING": self.add_mesh_ping_to_signalling_table(helpers.get_crc_24(data[2]).hex(), status="awaiting_ack") else: print("wrong mesh command") def mesh_signalling_dispatcher(self): # [timestamp, destination, router, frametype, payload, attempt, status] # --------------0------------1---------2---------3--------4---------5--------6 # while True: threading.Event().wait(1.0) for entry in MESH_SIGNALLING_TABLE: print(entry) timestamp = entry[0] attempt = entry[5] status = entry[6] # check for PING cases if entry[3] in ["PING", "PING-ACK"] and attempt < 30 and status not in ["acknowledged"]: # Calculate the transmission time with exponential increase #transmission_time = timestamp + (2 ** attempt) * 10 # Calculate transmission times for attempts 0 to 30 with stronger S-curves in minutes correction_factor = 750 transmission_time = timestamp + (4.5 / (1 + np.exp(-1. * (attempt - 5)))) * correction_factor * attempt # check if it is time to transmit if time.time() >= transmission_time: entry[5] += 1 print("transmit mesh ping") channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout: threading.Event().wait(0.01) self.transmit_mesh_signalling_ping(bytes.fromhex(entry[1])) else: pass #print("wait some more time") else: pass #print("...") def received_routing_table(self, data_in): try: print("data received........") print(data_in) router = data_in[1:4] # Extract the first 4 bytes (header) payload = data_in[4:] # Extract the payload (excluding the header) print("Router:", router) # Output the header bytes for i in range(0, len(payload)-1, 5): callsign_checksum = payload[i:i + 3] # First 3 bytes of the information (callsign_checksum) hops = int.from_bytes(payload[i+3:i + 4], "big") # Fourth byte of the information (hops) score = int.from_bytes(payload[i+4:i + 5], "big") # Fifth byte of the information (score) snr = int(ModemParam.snr) score = self.calculate_new_avg_score(score, self.calculate_score_by_snr(snr)) timestamp = int(time.time()) # use case 1: add new router to table only if callsign not empty _use_case1 = callsign_checksum.startswith(b'\x00') # use case 2: add new router to table only if not own callsign _use_case2 = callsign_checksum not in [helpers.get_crc_24(Station.mycallsign)] # use case 3: increment hop if router not direct if router not in [helpers.get_crc_24(b'direct')] and hops == 0: hops += 1 # use case 4: if callsign is directly available skip route for only keeping shortest way in db _use_case4 = False for _, call in enumerate(MeshParam.routing_table): # check if callsign already in routing table and is direct connection if callsign_checksum in [MeshParam.routing_table[_][0]] and MeshParam.routing_table[_][1] in [helpers.get_crc_24(b'direct')]: _use_case4 = True # use case N: calculate score # TODO... if not _use_case1 \ and _use_case2\ and not _use_case4: print("Callsign Checksum:", callsign_checksum) print("Hops:", hops) print("Score:", score) new_router = [callsign_checksum, router, hops, snr, score, timestamp] print(new_router) self.add_router_to_routing_table(new_router) print("-------------------------") for _, item in enumerate(MeshParam.routing_table): print(MeshParam.routing_table[_]) print("-------------------------") except Exception as e: self.log.warning("[MESH] error processing received routing broadcast", e=e) def calculate_score_by_snr(self, snr): if snr < -12 or snr > 12: raise ValueError("Value must be in the range of -12 to 12") score = (snr + 12) * 100 / 24 # Scale the value to the range [0, 100] if score < 0: score = 0 # Ensure the score is not less than 0 elif score > 100: score = 100 # Ensure the score is not greater than 100 return int(score) def calculate_new_avg_score(self, value_old, value): return int((value_old + value) / 2) def received_mesh_ping(self, data_in): destination = data_in[1:4].hex() if destination == Station.mycallsign_crc.hex(): print("its a ping for us") # use case 1: set status to acknowleding if we are the receiver of a PING self.add_mesh_ping_to_signalling_table(destination, status="acknowledging") channel_busy_timeout = time.time() + 5 while ModemParam.channel_busy and time.time() < channel_busy_timeout: threading.Event().wait(0.01) dxcallsign_crc = Station.mycallsign_crc self.transmit_mesh_signalling_ping_ack(dxcallsign_crc) # use case 2: set status to acknowledged if we are out of retries #self.add_mesh_ping_to_signalling_table(destination, status="acknowledged") else: print(f"its a ping for {destination}") # use case 1: set status to forwarding if we are not hte receiver of a PING self.add_mesh_ping_to_signalling_table(destination, status="forwarding") dxcallsign_crc = bytes.fromhex(destination) #self.transmit_mesh_signalling_ping(dxcallsign_crc) # use case 2: set status to forwarded if we are not the receiver of a PING and out of retries #self.add_mesh_ping_to_signalling_table(destination, status="forwarded") def received_mesh_ping_ack(self, data_in): # TODO: # Check if we have a ping callsign already in signalling table # if PING, then override and make it a PING-ACK # if not, then add to table destination = data_in[1:4].hex() timestamp = time.time() router = "" frametype = "PING-ACK" payload = "" attempt = 0 if destination == Station.mycallsign_crc.hex(): print("its a ping ack for us") status = "acknowledged" self.add_mesh_ping_ack_to_signalling_table(destination, status) else: status = "forwarding" self.add_mesh_ping_ack_to_signalling_table(destination, status) print(f"it is a ping ack for {destination}") print(MESH_SIGNALLING_TABLE) def add_mesh_ping_to_signalling_table(self, destination, status): timestamp = time.time() router = "" frametype = "PING" payload = "" attempt = 0 # [timestamp, destination, router, frametype, payload, attempt, status] # --------------0------------1---------2---------3--------4---------5--------6-----# new_entry = [timestamp, destination, router, frametype, payload, attempt, status] for _, item in enumerate(MESH_SIGNALLING_TABLE): # update entry if exists if destination in item[1] and "PING" in item[3]: update_entry = [item[0], destination, "", "PING", "", item[5], status] print(f"UPDATE {MESH_SIGNALLING_TABLE[_]} >>> {update_entry}") MESH_SIGNALLING_TABLE[_] = update_entry return # add new routing entry if not exists if new_entry not in MESH_SIGNALLING_TABLE: print(f"INSERT {new_entry} >>> SIGNALLING TABLE") MESH_SIGNALLING_TABLE.append(new_entry) def add_mesh_ping_ack_to_signalling_table(self, destination, status): timestamp = time.time() router = "" frametype = "PING-ACK" payload = "" attempt = 0 new_entry = [timestamp, destination, router, frametype, payload, attempt, status] for _, item in enumerate(MESH_SIGNALLING_TABLE): # update entry if exists if destination in item[1] and "PING" in item[3]: update_entry = [item[0], destination, "", "PING-ACK", "", item[5], status] print(f"UPDATE {MESH_SIGNALLING_TABLE[_]} >>> {update_entry}") MESH_SIGNALLING_TABLE[_] = update_entry return # add new routing entry if not exists if new_entry not in MESH_SIGNALLING_TABLE: print(f"INSERT {new_entry} >>> SIGNALLING TABLE") MESH_SIGNALLING_TABLE.append(new_entry) """ for _, item in enumerate(MESH_SIGNALLING_TABLE): print(item) # use case 3: PING ACK sets state to processed if we are the initiator of a PING and it is not yet acknowledged if destination == Station.mycallsign_crc.hex() and item[6] not in ["acknowledged"]: update_entry = [time.time(), destination, "", "PING", "", 0, "acknowledged"] print(f"UPDATE AND CHANGE {MESH_SIGNALLING_TABLE[_]} >>> {update_entry}") MESH_SIGNALLING_TABLE[_] = update_entry return # use case 1: PING-ACK updates PING-ACK, but stay at attempts if destination in item[1] and "PING-ACK" in item[3]: update_entry = [item[0], destination, "", "PING-ACK", "", item[5], "forwarding"] print(f"UPDATE {MESH_SIGNALLING_TABLE[_]} >>> {update_entry}") MESH_SIGNALLING_TABLE[_] = update_entry return # use case 2: PING-ACK overwrites PING # this avoids possible packet loops if destination in item[1] and "PING" in item[3]: update_entry = [time.time(), destination, "", "PING-ACK", "", 0, "forwarding"] print(f"UPDATE AND CHANGE {MESH_SIGNALLING_TABLE[_]} >>> {update_entry}") MESH_SIGNALLING_TABLE[_] = update_entry return if new_entry not in MESH_SIGNALLING_TABLE: print(f"INSERT {new_entry} >>> SIGNALLING TABLE") MESH_SIGNALLING_TABLE.append(new_entry) """ def enqueue_frame_for_tx( self, frame_to_tx, # : list[bytearray], # this causes a crash on python 3.7 c2_mode=FREEDV_MODE.sig0.value, copies=1, repeat_delay=0, ) -> None: """ Send (transmit) supplied frame to TNC :param frame_to_tx: Frame data to send :type frame_to_tx: list of bytearrays :param c2_mode: Codec2 mode to use, defaults to datac13 :type c2_mode: int, optional :param copies: Number of frame copies to send, defaults to 1 :type copies: int, optional :param repeat_delay: Delay time before sending repeat frame, defaults to 0 :type repeat_delay: int, optional """ #print(frame_to_tx[0]) #print(frame_to_tx) frame_type = FRAME_TYPE(int.from_bytes(frame_to_tx[0][:1], byteorder="big")).name self.log.debug("[TNC] enqueue_frame_for_tx", c2_mode=FREEDV_MODE(c2_mode).name, data=frame_to_tx, type=frame_type) # Set the TRANSMITTING flag before adding an object to the transmit queue # TODO: This is not that nice, we could improve this somehow TNC.transmitting = True modem.MODEM_TRANSMIT_QUEUE.put([c2_mode, copies, repeat_delay, frame_to_tx]) # Wait while transmitting while TNC.transmitting: threading.Event().wait(0.01) def transmit_mesh_signalling_ping(self, dxcallsign_crc): frame_type = bytes([FRAME_TYPE.MESH_SIGNALLING_PING.value]) ping_frame = bytearray(14) ping_frame[:1] = frame_type ping_frame[1:4] = dxcallsign_crc ping_frame[4:7] = helpers.get_crc_24(Station.mycallsign) ping_frame[7:13] = helpers.callsign_to_bytes(Station.mycallsign) self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.sig0.value) def transmit_mesh_signalling_ping_ack(self, dxcallsign_crc): #dxcallsign_crc = bytes.fromhex(data[1]) frame_type = bytes([FRAME_TYPE.MESH_SIGNALLING_PING_ACK.value]) ping_frame = bytearray(14) ping_frame[:1] = frame_type ping_frame[1:4] = dxcallsign_crc #ping_frame[4:7] = helpers.get_crc_24(Station.mycallsign) #ping_frame[7:13] = helpers.callsign_to_bytes(Station.mycallsign) self.enqueue_frame_for_tx([ping_frame], c2_mode=FREEDV_MODE.sig0.value)