Thingsboard PE downlink integration to Chirpstack V4 failed

Tom_Z · December 5, 2022, 6:03pm

i need to do a proper bug report on why integration+downlink converter doesn’t work for V4, but I am short on time, instead I will post here a method to do this for both TB CE and TB PE.

short: setup a rule chain to handle the downlink mqtt post to CS V4.

listen to attribute update (I use a widget that update attribute to trigger manual payload)
use the MQTT node in the rulechain
use a script to format the expected CS V4 payload
dynamically populate the devEUI in the MQTT Topic
dynamically populate app ID in the MQTT topic (can set application ID as attribute on the triggering device and dynamically populate app id in the topic)
** I am using static app id in this post

here is the mqtt node setup, i am using static APP ID for now and dynamic devEUI

here is the script node setup:

var msg = 
{
    "devEui": msg.deviceid.toLowerCase(),             
    "confirmed": true,                       
    "fPort": 6,                              
    "data": btoa(msg.payload),

}

return {msg: msg, metadata: metadata, msgType: msgType};

and final result in CS V4