I have an esp32 which I want to connect to a relay to control my garage door.
Problem is that the garage is far away from my house and I need to have a 4G router in the garage.
Can anyone help with suggesting how I can connect the esp32 to my home assistant server over internet?
Surely there must be an easier way. Can you not run a LAN cable? Have you investigated power line adaptors?
Its way too far for any such solution. I was thinking about LoRa but LoRa doesn’t work inside the garage and needs an outside antenna. Since some company installed the 4G router for the car charging infrastructure I thought that would be easier.
Unifi nano station AC loco can bridge network at least a mile.
I would bridge network to a switch and AP(if needed) in the garage.
I use this to provide network at my gate some 200’ from home. No dropouts and I have a palm tree waving between the two bridge devices so line of sight in no issue. Also no issues during hurricanes. I’ve been using these 7 yrs outdoor in direct sunlight (heat) and not a hiccup.
You could check if that 4G router supports a VPN tunnel, and set that up?
In that way, the LAN side in the garage would be part of your home LAN network 
No matter what your solution will be for the network connection I would also recommend maybe looking into a home Assistant in the garage. A small Pi3B+ might be enough.
This HA in the garage could then be integrated in the house HA with remote_homeassistant.
The two HAs can then work together when linked, but also independently if no connection is available.
If on 4G I would look at 2nd Pi
Tailscale or any overlay network would be good solution if using 4G
I still believe bridge network is simplest. In this case second pi is overkill since it is same local network.
Thanks guys!
Since the router is not mine I think I’ll go with the Pi (I have several lying around) and tailscale.
For some reason I didn’t think of putting a Pi there instead of an ESP.