Zigbee devices offline after polling timeout of 1830s

Hi,

I’m testing the zigbee binding with an Ember Coordinator and see my two routers and 1 end device getting flagged as offline after the timeout of 1830s has reached (no clue where this value is defined). However, everything seems to work fine.

Previously, in a different setup with zigbee2mqtt, I could see that the same routers (CC2530+CC2591 with koenkk firmware) send data about every minute and my end device (a Xiaomi Door Window Sensor) about every hour. So how come, the current setup marks them as offline after 1830s?

This is what I see in the logs:

2021-02-23 19:04:59.547 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'zigbee:device:3a4f49d56f:00158d0003121b0b' changed from OFFLINE to ONLINE
2021-02-23 19:04:59.549 [DEBUG] [.zigbee.handler.ZigBeeIsAliveTracker] - IsAlive Tracker scheduled task for thingUID=zigbee:device:3a4f49d56f:00158d0003121b0b in 1830 seconds
2021-02-23 19:20:34.988 [DEBUG] [ng.zigbee.handler.ZigBeeThingHandler] - 00158D0003121B0B: Polling [zigbee:device:3a4f49d56f:00158d0003121b0b:00158D0003121B0B_1_switch] channels...
2021-02-23 19:35:29.553 [DEBUG] [.zigbee.handler.ZigBeeIsAliveTracker] - IsAlive Tracker LastChance Timeout has been reached for thingUID=zigbee:device:3a4f49d56f:00158d0003121b0b
2021-02-23 19:35:29.558 [DEBUG] [ng.zigbee.handler.ZigBeeThingHandler] - 00158D0003121B0B: Polling stopped
2021-02-23 19:35:29.563 [DEBUG] [ng.zigbee.handler.ZigBeeThingHandler] - 00158D0003121B0B: Polling initialised at 1871140ms
2021-02-23 19:35:59.567 [DEBUG] [.zigbee.handler.ZigBeeIsAliveTracker] - IsAlive Tracker Timeout has been reached for thingUID=zigbee:device:3a4f49d56f:00158d0003121b0b
2021-02-23 19:35:59.573 [INFO ] [ab.event.ThingStatusInfoChangedEvent] - Thing 'zigbee:device:3a4f49d56f:00158d0003121b0b' changed from ONLINE to OFFLINE

thanks in advance

Stefan

should I open an issue on github? I wonder, how can I find out who is the author of the binding?