Basic Station WS keepalive/ping interval seems ~15s and not configurable #249
Description
Summary
We’re running ChirpStack Gateway Bridge v4 in Basic Station mode. On LTE gateways we see persistent ~15s keepalive traffic to the LNS (WSS). This appears to be WebSocket ping/pong (TLS encrypted), not application payload. The interval is too frequent for data‑capped LTE, and we can’t find any config option to change it.
Evidence
- Gateway is Semtech Basic Station (/usr/bin/lbs/station) connecting to wss://lns.stack927.com:443 via Gateway Bridge.
- Packet captures show ACK‑only traffic at ~15–16s intervals over the LNS TCP connection, even with no LoRaWAN traffic.
- No config option in chirpstack-gateway-bridge TOML for WS ping/keepalive; only MQTT keepalive in chirpstack config.
Implementation description
Expose a configuration option for the Basic Station WebSocket ping interval (and/or disable/adjust it), or document how to tune it. Default of ~15s is too aggressive for LTE/NAT environments.
Environment
- ChirpStack Gateway Bridge: chirpstack/chirpstack-gateway-bridge:4
- Basic Station backend (type="basic_station")
- LTE gateways with data cap