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import simplejson as json
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2
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import config
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3
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import time
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4
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from datetime import datetime
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5
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import paho.mqtt.client as mqtt
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6
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import random
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7
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import decimal
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8
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9
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10
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# global flag indicates the connectivity with the MQTT broker
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11
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mqtt_connected_flag = False
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12
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13
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14
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# the on_connect callback function for MQTT client
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15
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# refer to http://www.steves-internet-guide.com/client-connections-python-mqtt/
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16
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def on_mqtt_connect(client, userdata, flags, rc):
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17
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global mqtt_connected_flag
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18
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if rc == 0:
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19
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mqtt_connected_flag = True # set flag
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20
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print("MQTT connected OK")
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21
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else:
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22
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print("Bad MQTT connection Returned code=", rc)
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23
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mqtt_connected_flag = False
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24
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25
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26
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# the on_disconnect callback function for MQTT client
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27
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# refer to http://www.steves-internet-guide.com/client-connections-python-mqtt/
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28
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def on_mqtt_disconnect(client, userdata, rc=0):
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29
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global mqtt_connected_flag
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30
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31
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print("DisConnected, result code "+str(rc))
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32
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mqtt_connected_flag = False
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33
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34
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35
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########################################################################################################################
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36
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# Test Procedures
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37
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# Step 1: Connect the MQTT broker
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38
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# Step 2: Publish test topic messages
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39
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# Step 3: Run 'mosquitto_sub -h 192.168.0.1 -v -t myems/point/# -u admin -P Password1' to receive test messages
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40
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########################################################################################################################
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41
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42
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def main():
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43
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global mqtt_connected_flag
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44
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mqc = None
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45
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try:
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46
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mqc = mqtt.Client(client_id='MYEMS' + "-" + str(time.time()))
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47
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mqc.username_pw_set(config.myems_mqtt_broker['username'], config.myems_mqtt_broker['password'])
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48
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mqc.on_connect = on_mqtt_connect
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49
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mqc.on_disconnect = on_mqtt_disconnect
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50
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mqc.connect_async(config.myems_mqtt_broker['host'], config.myems_mqtt_broker['port'], 60)
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51
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# The loop_start() starts a new thread, that calls the loop method at regular intervals for you.
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52
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# It also handles re-connects automatically.
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53
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mqc.loop_start()
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54
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55
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except Exception as e:
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56
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print("MQTT Client Connection error " + str(e))
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57
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while True:
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58
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if mqtt_connected_flag:
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59
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try:
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60
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# publish real time value to mqtt broker
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61
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payload = json.dumps({"data_source_id": 1,
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62
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"point_id": 3,
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63
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"utc_date_time": datetime.utcnow().isoformat(timespec='seconds'),
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64
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"value": decimal.Decimal(random.randrange(0, 10000))})
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65
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print('payload=' + str(payload))
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66
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info = mqc.publish('myems/point/' + str(3),
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67
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payload=payload,
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68
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qos=0,
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69
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retain=True)
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70
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except Exception as e:
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71
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print("MQTT Publish Error : " + str(e))
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72
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# ignore this exception, does not stop the procedure
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73
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pass
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74
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time.sleep(1)
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75
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else:
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76
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print('MQTT Client Connection error')
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77
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time.sleep(1)
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78
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79
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80
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if __name__ == "__main__":
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81
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main()
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82
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myems /
myems-mqtt-publisher
