Integrate Mullvad-Check Tool as docker environment with gluetun

[redtripleAAA]

### RFE - Question

>>>> Summary:
I just deployed a new setup using Raspberry Pi4 (Did step 2 in ReadMe) ;)
And port forwarding feature with Mullvad
Things working great

>>>> Maybe this is RFE:
Is it possible to add the following to your list of HTTP API
https://ipv4.am.i.mullvad.net/port/54823
This is from: https://mullvad.net/en/check/

For example, with Mullvad, where it uses the same env in docker compose
- FIREWALL_VPN_INPUT_PORTS=54823
And then returns the status result

>>>> Why I think this is would be good idea?
With that, I can run a PowerShell/Python script to send me Telegram/Email on-demand to retrieve both public IP address and the port (I know it's static with Mullvad)

Also, it's convenient to have that feature for a faster access to resources

Cheers

[qdm12]

It looks like https://ipv4.am.i.mullvad.net/port/54823 only checks if the port is reachable at your IP. For example without VPN accessing https://ipv4.am.i.mullvad.net/port/443 gives me true with my public IP address.

You can retrieve the public IP Address and the forwarded port from the API already, in a Mullvad neutral way.

However, I can add something to try reaching the forwarded port, probably return an extra field (true/false) when you access the forwarded port in the http control server, that could be cool.

[redtripleAAA]

In the meantime, I have created a PowerShell 7 script on always-on Windows 10 MiniPC, that makes a call to the Gluetun HTTP Control Server and retrieve the current VPN IP and adds the port into a text format along with the IP

**Using:** https://github.com/qdm12/gluetun/wiki/HTTP-Control-server

Example:
https://1.1.1.1:3214

And then it sends via PowerShell 7 to Telegram bot chat
**Using:** https://github.com/techthoughts2/PoshGram

It's a workaround for RFE:
#397

With all of that, whenever I need to access my resources remotely over the Port Forwarding VPN, I just hit remotely request for the schedule task to run and it sends me the complete URL (http://IP:Port)
**Using:** https://intercom.help/pulseway/en/articles/1514296-enable-scheduled-task-monitoring

I know a lot of tools being used, however, the purpose was served 💯