mirror of
https://github.com/projecthorus/sondehub-infra.git
synced 2024-12-22 22:42:27 +00:00
73 lines
2.1 KiB
Python
73 lines
2.1 KiB
Python
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import sys
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sys.path.append("vendor")
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import json
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import os
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import paho.mqtt.client as mqtt
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import time
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client = mqtt.Client(transport="websockets")
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connected_flag = False
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def connect():
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client.on_connect = on_connect
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client.on_disconnect = on_disconnect
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client.on_publish = on_publish
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client.tls_set()
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client.username_pw_set(username=os.getenv("MQTT_USERNAME"), password=os.getenv("MQTT_PASSWORD"))
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client.connect(os.getenv("MQTT_HOST"), 443, 5)
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client.loop_start()
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print("loop started")
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def on_disconnect(client, userdata, rc):
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global connected_flag
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print("disconnected")
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connected_flag=False #set flag
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def on_connect(client, userdata, flags, rc):
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global connected_flag
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if rc==0:
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print("connected")
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connected_flag=True #set flag
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else:
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print("Bad connection Returned code=",rc)
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def on_publish(client, userdata, mid):
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pass
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connect()
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def lambda_handler(event, context):
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client.loop(timeout=0.05, max_packets=1) # make sure it reconnects
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for record in event['Records']:
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sns_message = record["Sns"]
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if type(json.loads(sns_message["Message"])) == dict:
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incoming_payloads = [json.loads(sns_message["Message"])]
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else:
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incoming_payloads = json.loads(sns_message["Message"])
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#send only the first, last and every 5th packet
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payloads = [incoming_payloads[0]] + incoming_payloads[1:-1:5][1:] + [incoming_payloads[-1]]
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for payload in payloads:
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body = json.dumps(payload)
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serial = payload['serial']
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while not connected_flag:
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time.sleep(0.01) # wait until connected
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client.publish(
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topic=f'sondes/{serial}',
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payload=body,
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qos=0,
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retain=False
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)
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client.publish(
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topic=f'batch',
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payload=json.dumps(payloads),
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qos=0,
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retain=False
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)
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time.sleep(0.05) # give paho mqtt 100ms to send messages this could be improved on but paho mqtt is a pain to interface with
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