Request for doc/code/ which convert MQTT Json Downlink JSON to Semtech Downlink Json(UDP) Format

[mightChamp]

Hello,

I am using chripstack on my server, My gateway is custom made gateway, I want to use MQTT protocol rather than Semtech UDP Packet Forwarder. I get success in uplinks using MQTT packet structure as mentioned here. But In downlink, json packet, some parameters are missing comapred to semtech udp downlink packet.

Semtech Downlink Json: {“txpk”:{ “imme”:true, “freq”:864.123456, “rfch”:0, “powe”:14, “modu”:“LORA”, “datr”:“SF11BW125”, “codr”:“4/6”, “ipol”:false, “size”:32, “ncrc”:true, “data”:“H3P3N2i9qc4yt7rK7ldqoeCVJGBybzPY5h1Dd7P7p8v” }}

Chripstack MQTT Downlink Json :

{ “phyPayload”:“YGcsBACQAAAAGzv2H29bigkqF3roPD1jQ5tyAJkJqZIn09HH”, “txInfo”:{ “gatewayID”:“fJ69z///vKA=”, “frequency”:865062500, “power”:27, “modulation”:“LORA”, “loRaModulationInfo”:{ “bandwidth”:125, “spreadingFactor”:12, “codeRate”:“4/5”, “polarizationInversion”:true }, “board”:0, “antenna”:0, “timing”:“DELAY”, “delayTimingInfo”:{ “delay”:“1s” }, “context”:null }, “token”:14831, “downlinkID”:“Oe9C1x0dSkKLZO2gMwmpGw==”, “items”:[ { “phyPayload”:“YGcsBACQAAAAGzv2H29bigkqF3roPD1jQ5tyAJkJqZIn09HH”, “txInfo”:{ “gatewayID”:null, “frequency”:865062500, “power”:27, “modulation”:“LORA”, “loRaModulationInfo”:{ “bandwidth”:125, “spreadingFactor”:12, “codeRate”:“4/5”, “polarizationInversion”:true }, “board”:0, “antenna”:0, “timing”:“DELAY”, “delayTimingInfo”:{ “delay”:“1s” }, “context”:null } }, { “phyPayload”:“YGcsBACQAAAAGzv2H29bigkqF3roPD1jQ5tyAJkJqZIn09HH”, “txInfo”:{ “gatewayID”:null, “frequency”:866550000, “power”:27, “modulation”:“LORA”, “loRaModulationInfo”:{ “bandwidth”:125, “spreadingFactor”:10, “codeRate”:“4/5”, “polarizationInversion”:true }, “board”:0, “antenna”:0, “timing”:“DELAY”, “delayTimingInfo”:{ “delay”:“2s” }, “context”:null } } ], “gatewayID”:“fJ69z///vKA=” }

Missing Parameter in Chripstack MQTT JSON Data:

timestamp to transmit data RF Chain to be use Data Size CRC I cannot use chripstack gateway bridge to convert MQTT to semtech UDP packet format, as only want to use MQTT. So, I need help to get missing data information.

How gateway bridge code converts MQTT JSON format to UDP format? How can I get 4 missing parameter from MQTT JSON data?

Thank You

[brocaar]

How gateway bridge code converts MQTT JSON format to UDP format?

I'm closing this issue as this is more of a consultancy question than bug report or feature request. Please consult the source-code, you will find everything in this repository.