Format and content of a Gateway Bridge to Network Server messages

ChirpStack Network Server
1

Hi,

Can someone send me the format and content of the exact package of the gateway bridge to loraserver when you send join request from node !

I’m trying to publish mqtt subject like gateway bridge and emulate join request of lora node, the node are created on the lora app server, but not yet activated ! but i’m not sur of the encode data that gateway bridge send to loraserver, this is what i try :

Python script :

import paho.mqtt.client as paho
import time
import json

broker="127.0.0.1"
port=1883
#with open("data.json", "r") as jsonFile:
#        data = json.load(jsonFile)
#data = '{"rxInfo":{"mac":"a10b20c20d30e40f","time":"2019-11 25T13:45:30.937991Z","timestamp":2223916764,"frequency":868100000,"channel":0,"rfChain":1,"crcStatus":1,"codeRate":"4/5","rssi":-80,"loRaSNR":12.8,"size":23,"dataRate":{"modulation":"LORA","spreadFactor":12,"bandwidth":125},"board":0,"antenna":0},"phyPayload":"AAgHBgUEAwIBGIo3czg1MTHDwzrxBX4="}'
data =  "AAEBAQEBAQEBLRIAu8zd7v+bu7Gn4ts="
while 1:
 
    def on_publish(client,userdata,result):             #create function for callback
        print("data published \n")
        pass

    client1= paho.Client("abcdef1.....1010")                           #create client object
    client1.on_publish = on_publish                          #assign function to callback
    client1.connect("127.0.0.1",1883,60)                                 #establish connection
    ret= client1.publish("gateway/abcdef1.....1010/event/up",data)
    time.sleep(10)

But the response of loraserver is clear, he can’t decode the message :

Loraserver Frame Log :

       ERRO[1617] gateway/mqtt: unmarshal uplink frame error    data_base64="MDExMTExMTExNDUxODAxODcyMDQyMjEyMzgyNTUxNTUxODcxNzcxNjcyMjYyMTk=" error="unexpected EOF"

Thanks

2

The current version of the ChirpStack Network Server and ChirpStack Gateway Bridge are using Protobuf definitions, that you can find here: https://github.com/brocaar/chirpstack-api/tree/master/protobuf/gw

These definitions can be used for binary Protobuf encoding, but can also used for JSON encoding/decoding (see also: https://developers.google.com/protocol-buffers/docs/proto3#json).

1 Like
3

Thanks ! i will check the doc

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