Just a tip ....
I've been using these Nport 5410 for Ether->Serial comms (RS-232 +/- 12v levels)
https://www.ebay.com/itm/MOXA-Serial-Device-Server-Nport-5410-RS-232/174235845514Works excellent with lots of stuff , including Lady Heather (GPSDO sw) , just set 10ms timeout on the channel.
Point heather to the ip addy:400x - where x is the channel (1..4)
From my heather.cfg
-ip=192.168.xxx.yyyy:4001
They're industrial , and accept wide dc psu voltage ... 9..24v i think (check)
Edit: The older DE-304 works too (no https , only http mgmt. if)
/Bingo