How To Connect Chirpstack Gateway (PI4 + Hat concentrator) to the ChirpStack V3 LNS (PI4) Using MQTT Bridge

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Hello everyone,
I have a LORAwan network + 3 sensors that works well but is expensive because of the 7268V2.
PI4 Lorawan server (ChirpStack) + RAK 7268V2 Gateway using mqtt bridge of RAK 7268V2

I am trying to do the same thing with a different configuration using a PI4B and a recovery HAT:
PI4 Lorawan server ChirpStack + PI4 (Gateway shirpstack+ HAT RAK Concentrator 2287). I am configuring it with the same information as with the RAK7268V2, but I only receive messages from the gateway in MQTT, such as see bellow (the server does receive information from the PI4B gateway Hat RAK2287 but no payload)

Has anyone else tried configurations like this? What could be the configuration problem?
Thanks in advance for your help.
Arnaud

28:26][DEBUG] : : {"RAK2287":{"gateway":{"0016c001f107e3b5":{"event":{"stats":"\u0012\u000b\b\ufffd\ufffd\ufffd\ufffd\u0006\u0010\ufffd\ufffd\ufffdA(\u00020\u0001R\u0011\n\u0005model\u0012\brak_2287R\u001e\n\u000bhal_version\u0012\u000fVersion: 2.1.0;R\u001e\n\u0015concentratord_version\u0012\u00054.5.2R\u0010\n\u000econfig_versionR\u001f\n\u0016mqtt_forwarder_version\u0012\u00054.4.1j\b\b\ufffd\ufffd\ufffd\ufffd\u0003\u0

2 Answers

Orne,
i understand now why it doesn't work.
My Lora server is based on Chirpstack 3 (Jeedom LNS). I can't change this (official plugin of Jeedom.It's the french tool same as Home assistant)

I have to test a gateway on a RPI 4 with Chirpstack 3.
Does an image of the full gateway os V3 for RPI4 availble(...img.gz) ?

Arnaud