waggle-network-sensor-bridge/main.py

#!/usr/bin/python

from waggle.plugin import Plugin
import time
#import paho.mqtt.client as paho
import logging
import asyncio
import os
from amqtt.broker import Broker
import yaml
from amqtt.client import MQTTClient, ClientException
from amqtt.mqtt.constants import QOS_1, QOS_2
import json
import base64
import numpy as np
import cv2 as cv


sublist = []
sensorlist = []
devicelist = []

showData = True # debug print

async def broker_coro(brokerconfig):
    broker = Broker(config=brokerconfig)
    await broker.start()

async def uptime_coro():
    C = MQTTClient()
    await C.connect('mqtt://127.0.0.1:1883/') # connect to my own broker
    # Subscribe to '$SYS/broker/uptime' with QOS=1
    # Subscribe to '$SYS/broker/load/#' with QOS=2
    #await C.subscribe([
    #        ('a/b', QOS_1),
    #     ])
    await C.subscribe(sublist)
    try:
        count = 0
        while True:
            count = count + 1
            message = await C.deliver_message()
            packet = message.publish_packet
            dictout = decoder(packet.payload.data)
            print("%d:  %s => %s" % (count, packet.variable_header.topic_name, dictout))
            if packet.variable_header.topic_name.split("/")[-1] == "camera": # trigger image loading
                print(len(dictout["data"]))
                img = np.frombuffer(base64.b64decode(dictout["data"]), np.uint8)
                cv.imwrite('./output.jpg', img)

            else:
                publishData(str(dictout["data"]), str(dictout["sensorID"]), str(packet.variable_header.topic_name.split("/")[-1]), dictout["timestamp"])
        #await C.unsubscribe(['a/b'])
        #await C.disconnect()
    except ClientException as ce:
        logger.error("Client exception: %s" % ce)


def publishData(data, sensorID, sensorType, dataTimestamp):
    with Plugin() as plugin:
            if showData is True:
                print("publishing network.bridge.sensor." + sensorType + " with metadata:", {"sensorID": sensorID, "sensorType": sensorType}, "and timestamp:", dataTimestamp, "and data:", data)
            else:
                print("publishing network.bridge.sensor." + sensorType + "with metadata", {"sensorID": sensorID, "sensorType": sensorType})
            # send data to waggle:
            plugin.publish("network.bridge.sensor." + sensorType, data, meta={"sensorID": str(sensorID), "sensorType": str(sensorType)}, timestamp=dataTimestamp)

sensorcount = 0
devicecount = 0

def subdict(d, header):
    # coordinate mqtt topic names and waggle topics / sensor names
    global sensorcount
    global devicecount
    for k,v in d.items():        
        if isinstance(v, dict):
            if header is not None:
                subdict(v, header + k + "/") # recurse further
            else:
                subdict(v, k + "/")
        else:            
            for sensor in v:
                sublist.append((header + k + "/" + sensor, QOS_2))
                sensorlist.append((header + k + "/" + sensor, sensorcount))
                sensorcount = sensorcount + 1
                if (header + k + "/", devicecount) not in devicelist:
                    devicelist.append((header + k + "/", devicecount))
                    devicecount = devicecount + 1

                #print (((header + k + "/" + sensor, QOS_2), sensorcount))

def decoder(data):
    print (data)
    return json.loads(data.decode("utf-8"))

if __name__ == "__main__":
    # mqtt broker config
    with open('broker.yaml', 'r') as fileread:
        brokerconfig = yaml.safe_load(fileread)

    # clients config
    with open('subscribe.yaml', 'r') as fileread:
        clientconfig = yaml.safe_load(fileread)
    subdict(clientconfig, None)
    print("sublist:", sublist)
    print("sensors:", sensorlist)
    print("devices:", devicelist)

    formatter = "[%(asctime)s] :: %(levelname)s :: %(name)s :: %(message)s"
    logging.basicConfig(level=logging.ERROR, format=formatter)
    asyncio.get_event_loop().run_until_complete(broker_coro(brokerconfig))
    asyncio.get_event_loop().run_until_complete(uptime_coro())
    asyncio.get_event_loop().run_forever()

    #publishData(1, "0", sensortypes[0], time.time_ns())