ESPHome powered sensors connected via LTE to my homeassistant instance

Hello,
I would like to monitor the environment in my dog trailer.
The idea is to connect the sensors to an ESPHome powered device.
This one is connected via WiFi to a LTE server installed in the trailer.
The data should send over internet to my homeassistant instance in my house (connected via NabuCasa).

At least I want to see the data in the companion app on my android mobile.

Is there a way to do this?
And is it save against intruders?
Thanks
Uwe

dog trailer

you need to enable support in esphome mqtt. Forward the port on the router mqtt to your home assistant server. This is how my devices are connected at my workplace.
look here

Thanks!
MQTT was not on my scope!

there is nothing complicated just a couple of lines of code. everything else the esphome code does not change.
This is the only way to connect devices outside of your home network