forked from iarv/meshview
Jason Michalski
47 lines
1.5 KiB
Python
47 lines
1.5 KiB
Python
import base64
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import asyncio
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import aiomqtt
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from google.protobuf.message import DecodeError
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from cryptography.hazmat.primitives.ciphers import Cipher, algorithms, modes
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from meshtastic.mqtt_pb2 import ServiceEnvelope
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KEY = base64.b64decode("1PG7OiApB1nwvP+rz05pAQ==")
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def decrypt(packet):
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if packet.HasField("decoded"):
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return
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packet_id = packet.id.to_bytes(8, "little")
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from_node_id = getattr(packet, "from").to_bytes(8, "little")
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nonce = packet_id + from_node_id
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cipher = Cipher(algorithms.AES(KEY), modes.CTR(nonce))
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decryptor = cipher.decryptor()
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raw_proto = decryptor.update(packet.encrypted) + decryptor.finalize()
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try:
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packet.decoded.ParseFromString(raw_proto)
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except DecodeError:
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pass
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async def get_topic_envelopes(topic):
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while True:
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try:
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async with aiomqtt.Client(
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"mqtt.meshtastic.org", username="meshdev", password="large4cats"
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) as client:
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await client.subscribe(topic)
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async for msg in client.messages:
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try:
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envelope = ServiceEnvelope.FromString(msg.payload)
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except DecodeError:
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continue
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decrypt(envelope.packet)
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if not envelope.packet.decoded:
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continue
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yield msg.topic.value, envelope
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except aiomqtt.MqttError as e:
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await asyncio.sleep(1)
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