TTN payload decoding script for SenseCAP LoRaWAN messages This script is used for decoding the LoRaWAN messages sent from the SenseCAP nodes. After decoding, users' applications will get more friendly and readable messages from TTN data API.
We assume that you already setup your gateway and SenseCAP nodes correctly, and the SenseCAP nodes can send messages to your TTN application. You can already observe the data transmisstion through TTN console.
- Please navigate to the
Payload Formats
tab of your application to which your SenseCAP nodes send data. - Select
Custom
forPayload Format
- Copy and paste the whole contents of
decoder.js
to thedecoder
textarea. - Click
save payload functions
You may test the decoding script with sample payload first. To do this, just copy 01 01 10 98 53 00 00 01 02 10 A8 7A 00 00 AF 51
into the Payload
text input, and click Test
button. If succeeded, you will see a successfully parsed JSON structure below.
Then let's check out the magic of the script. We navigate to the Data
tab, and you can expand any uploaded message to check the Fields
in the payload. These fields are just populated by the script.
If you're subscribing the messages with TTN's MQTT Data API, you will also get parsed JSON payload fields.
Client mosq-TCSlhYcKaRCn3cIePE received PUBLISH (d0, q0, r0, m0, 'lorawan868/devices/2cf7f12010700041/up', ... (719 bytes))
lorawan868/devices/2cf7f12010700041/up {"app_id":"lorawan868","dev_id":"2cf7f12010700041","hardware_serial":"2CF7F12010700041","port":2,"counter":1119,"confirmed":true,"payload_raw":"AQEQYG0AAAECEOj9AACWSA==","payload_fields":{"err":0,"messages":[{"measurementId":4097,"measurementValue":28,"type":"report_telemetry"},{"measurementId":4098,"measurementValue":65,"type":"report_telemetry"}],"payload":"010110606D0000010210E8FD00009648","valid":true},"metadata":{"time":"2020-03-13T09:09:45.834032725Z","frequency":867.3,"modulation":"LORA","data_rate":"SF7BW125","airtime":66816000,"coding_rate":"4/5","gateways":[{"gtw_id":"eui-2cf7f11014300001","timestamp":1779605971,"time":"2020-03-13T09:09:45.672666033Z","channel":4,"rssi":-66,"snr":8.8,"rf_chain":0}]}}
How many message types and what's the structure of each message type?
We will document the latest message types in the comment header of the script. Please check out here.