I set up a TTIG Indoor Gateway about 3 weeks ago. Since then, I noticed it was losing connection and reconnecting a few times an hour. The green LED would start flashing, and eventually go solid. I had a device sending an uplink packet every minute, so idle connections were not the problem.
After looking at some tcpdump captures, it appeared that my router / firewall (pfsense) was expiring its ARP cache entry for the TTIG every 20 minutes, which is definitely normal. However, the TTIG device was not responding to ARP requests from the router and eventually rebooting. This corresponded to the outages I was seeing. Last night, I added a static DHCP entry with a corresponding static ARP mapping, and this problem has not recurred.
This ARP response problem seems like a bug in the TTIG firmware. Coincidentally, I noticed it does not respond to pings unless pings are coming from the router. Does updated firmware fix this?
Anyway I hope this is helpful to anyone experiencing these sorts of problems. The static ARP entry definitely seems to work.