Mesh relay can´t keep up connection

ChirpStack Gateway Mesh
1

I have two gatways consisting of two RPI4Bs with SeeedStudio SX1302 concentrator hats. Both are flashed with the latest 4.6.2 version of CS Gateway OS.

When I try to enable the gateway mesh functionality only the border gateway shows activity from the gateway-mesh component in its logs.
The relay gateway is registering the end-device´s uplinks but does nothing further with them.

I found out that the gateway-mesh service is not automatically starting on the relay gateway. When I start it manually over SSH, the gateway can send the mesh heartbeat and shows up in the NS.
After a few seconds I get the following error:

2025-02-20T15:44:14.626Z INFO  [chirpstack_gateway_mesh::heartbeat] Sending heartbeat packet, downlink_id: 722560456, mesh_packet: [Heartbeat hop_count: 1, timestamp: SystemTime { tv_sec: 1740066254, tv_nsec: 626754520 }, relay_id: f1118fbd]
2025-02-20T15:44:14.626Z INFO  [chirpstack_gateway_mesh::backend] Sending mesh frame - [downlink_id: 722560456 - [freq: 868100000, power: 16, mod: [LORA - sf: 7, bw: 125000], timing: [IMMEDIATELY]]]
2025-02-20T15:44:14.628Z INFO  [chirpstack_gateway_mesh::backend] Enqueue acknowledged, downlink_id: 722560456
2025-02-20T15:44:15.687Z INFO  [chirpstack_gateway_mesh::backend] Mesh frame received - [uplink_id: 506949306, freq: 868100000, rssi: -18, snr: 10.25, mod: [LORA - sf: 7, bw: 125000]]
2025-02-20T15:45:03.482Z INFO  [chirpstack_gateway_mesh::backend] Frame received - [uplink_id: 744626473, freq: 867900000, rssi: -40, snr: 12.75, mod: [LORA - sf: 10, bw: 125000]]
2025-02-20T15:45:03.482Z ERROR [chirpstack_gateway_mesh::backend] Handle event error: Modulation: Modulation { parameters: Some(Lora(LoraModulationInfo { bandwidth: 125000, spreading_factor: 10, code_rate_legacy: "", code_rate: Cr45, polarization_inversion: false, preamble: 0, no_crc: false })) } does not map to a data-rate

I already checked the region_eu868.toml file, which is existing.

Any ideas what I can do to fix this issue?

2

Update:
Even after hours of trying, an CS OS update via the sysupgrade package and a reflash of the RPIs SD card I couldn´t get it to work.

What finally helped was to fully format the SD card (not fast formatting in Windows) and to reflash it with the factory image.

I think that by first enabling the normal MQTT forwarder as well as trying out various settings on the relay gateway I might have messed up the mesh functionality - there might be a bug here but I can´t say for sure.

So if you come across this thread just change the settings you have to and if nothing works try a completely fresh install.