Background
I’m trying to enable remote access to my local Home Assistant OS installed on my Raspberry Pi 4, so that I can upload my location to the HAOS while I’m outside.
Therefore, I’ve authored an add-on to achieve that by leveraging the FRP software, which can forward traffic from my online server with public IP to the local HAOS.
Github Repo
GitHub - huxiaoxu2019/hass-addon-frp-client: Home Assistant Community Add-on: FRP Client
I’m new for Home Assistant OS, but enthusiastic about investigating the Home Smart and programming. Any feedback or issue will be super appreciated, you can leave your problem here or open an issue in Github. Thanks so much!!1 
Original Post
Home Assistant Add-on: FRP Client