{"id":968,"date":"2020-07-03T16:48:18","date_gmt":"2020-07-03T14:48:18","guid":{"rendered":"http:\/\/www.embedded-communication.com\/?p=968"},"modified":"2020-07-06T08:14:33","modified_gmt":"2020-07-06T06:14:33","slug":"english-read-lorawan-data-from-ttn-server","status":"publish","type":"post","link":"https:\/\/www.embedded-communication.com\/en\/misc\/english-read-lorawan-data-from-ttn-server\/","title":{"rendered":"Read LoRaWAN data from TTN server"},"content":{"rendered":"

<\/p>\n

TTN – The Things Network<\/h1>\n

https:\/\/www.thethingsnetwork.org\/<\/a><\/p>\n

Our LoRaWAN sensors use the service of The Things Network. So our LoRaWAN gateway sends the sensor data to the TTN server. The sensors are registered with an ‘application id’ and a ‘device id’.<\/p>\n

https:\/\/console.thethingsnetwork.org\/<\/a><\/p>\n

Now I want to receive the data on my PC. The TTN server allows to use MQTT.<\/p>\n

https:\/\/www.thethingsnetwork.org\/docs\/applications\/mqtt\/quick-start.html<\/a><\/p>\n

Note: Currently only the up-topic is working and get the data in JSON format.<\/p>\n

https:\/\/status.thethings.network\/<\/a><\/p>\n

 <\/p>\n

mosquitto – https:\/\/mosquitto.org\/<\/a><\/h2>\n

Please read the base information on<\/p>\n

https:\/\/www.thethingsnetwork.org\/docs\/applications\/mqtt\/quick-start.html<\/a><\/p>\n

We want to subscribe using TLS. The access schema seems to be a little bit different. In our case only with the option ‘-L’ it was possible to switch to TLS communication:<\/p>\n

mosquitto_sub.exe -L mqtts:\/\/<AppID>:<AppKey>@<region>.thethings.network:8883\/+\/devices\/+\/up –cafile mqtt-ca.pem<\/p>\n

We receive<\/p>\n

{\r\n  \"app_id\":\"stm32_example_usi_expansion_board\",\r\n  \"dev_id\":\"sensor-ro-20200522\",\r\n  \"hardware_serial\":\"E24F43FFFE44C1EF\",\r\n  \"port\":99,\"counter\":605,\r\n  \"payload_raw\":\"AHMnSwFnARYCaFADAGQEAQAFAdc=\",\r\n  \"payload_fields\":{\r\n    \"barometric_pressure_0\":1005.9,\r\n    \"digital_in_3\":100,\r\n    \"digital_out_4\":0,\r\n    \"digital_out_5\":215,\r\n    \"relative_humidity_2\":40,\r\n    \"temperature_1\":27.8\r\n  },\r\n  \"metadata\":{\r\n    \"time\":\"2020-07-03T14:02:59.272943586Z\",\r\n    \"frequency\":868.1,\r\n    \"modulation\":\"LORA\",\r\n    \"data_rate\":\"SF9BW125\",\r\n    \"airtime\":246784000,\r\n    \"coding_rate\":\"4\/5\",\r\n    \"gateways\":[\r\n      {\r\n        \"gtw_id\":\"eui-3133303735005600\",\r\n        \"timestamp\":920207212,\r\n        \"time\":\"\",\r\n        \"channel\":0,\r\n        \"rssi\":-44,\r\n        \"snr\":11.75,\r\n        \"rf_chain\":0\r\n      }\r\n    ]\r\n  }\r\n}<\/pre>\n
 <\/p>\n
Python<\/h2>\n
Our solution is based on the package paho-mqtt.<\/p>\n
https:\/\/pypi.org\/project\/paho-mqtt\/<\/a><\/p>\n
At the first you have to install it to your python environment. Possible you have to update your paket manager at the first.<\/p>\n
example Win10: (of course python should be installed already)<\/p>\n
cd Python37-32\r\npython -m pip install --upgrade pip\r\ncd scripts\r\npip install paho-mqtt<\/pre>\n
Now start the python shell – IDLE (Python 3.7 32-bit)<\/p>\n
Load\/create the small script mqtt.py. It print the sensor value temperature.<\/p>\n
\r\nimport paho.mqtt.client as mqtt\r\nimport json\r\n\r\n# The callback for when the client receives a CONNACK response from the server.\r\ndef on_connect(client, userdata, flags, rc):\r\n    print('Connected with result code '+str(rc))\r\n    client.subscribe('+\/devices\/+\/up')\r\n\r\n# The callback for when a PUBLISH message is received from the server.\r\ndef on_message(client, userdata, msg):\r\n    ergebnis = json.loads(msg.payload)\r\n    values = ergebnis['payload_fields']\r\n    print(values['temperature_1'])\r\n\r\nclient = mqtt.Client()\r\nclient.on_connect = on_connect\r\nclient.on_message = on_message\r\nclient.tls_set()\r\nclient.username_pw_set('AppId',password='AppKey')\r\n\r\nclient.connect('eu.thethings.network', 8883, 60)\r\n\r\nclient.loop_forever()\r\n<\/pre>\n
Of course you have to configure your AppId and AppKey.<\/p>\n
Output:<\/p>\n
Connected with result code 0\r\n27.9\r\n27.9\r\n27.9\r\n27.9\r\n27.8\r\n27.9\r\n27.8\r\n27.8\r\n27.8\r\n27.8\r\n27.8<\/pre>\n
 <\/p>","protected":false},"excerpt":{"rendered":"
TTN – The Things Network https:\/\/www.thethingsnetwork.org\/ Our LoRaWAN sensors use the service of The Things Network. So our LoRaWAN gateway sends the sensor data to the TTN server. The sensors are registered with an ‘application id’ and a ‘device id’. https:\/\/console.thethingsnetwork.org\/ Now I want to receive the data on my PC. The TTN server allows … Continue reading “Read LoRaWAN data from TTN server”<\/span><\/a><\/p>\n","protected":false},"author":8,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[36],"tags":[],"class_list":["post-968","post","type-post","status-publish","format-standard","hentry","category-misc"],"yoast_head":"\nRead LoRaWAN data from TTN server - embedded communication<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/www.embedded-communication.com\/en\/misc\/english-read-lorawan-data-from-ttn-server\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"Read LoRaWAN data from TTN server - embedded communication\" \/>\n<meta property=\"og:description\" content=\"TTN – The Things Network https:\/\/www.thethingsnetwork.org\/ Our LoRaWAN sensors use the service of The Things Network. 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