Integrate Resin Wifi Connect as tool for wifi configuration

[hongquan]

Is your feature request related to a problem? Please describe.
Today I test the Access Point feature and feel that it is weird:

• Have to manually type 10.0.0.1:5000 in browser. I think it should provide a Captive Portal, so that Android will automatically show a login page upon connecting to the SUSI.AI wifi.
• After visiting 10.0.0.1:5000, I only get a blank page (with 1 line of title). No link, no form. I expect that there are some links or a form to guide me what to do.
• All the suppages (/wifi_credentials, /config) contain no form. It instead requires user to manually add data to the URL.
• I found that, to activate the Access Point, our script wap.sh directly edit /etc/network/interfaces files. I think that this approach is dangerous and error-prone. If a mistake is made, our RPI can be bricked. We should call some network management tool and let that tool handle all the network config files.

Describe the solution you'd like
I found a software, https://github.com/resin-io/resin-wifi-connect, which serves the same purpose (configure Wifi for RPi, by creating an Access Point from RPi), which is more complete than ours. I think we can reuse it in our project.
What I concern is that, it seems to require NetworkManager installed on RPi. But NetworkManager (in full form) is a desktop app and will pull a lot of GUI dependencies.
But maybe it only requires a minimal form of NetworkManager (no GUI). Need to check if Debian allows to install that form.

Btw, I propose to name this feature (create AP to configure wifi for RPi) as Wifi WebConfig, because the access point created here is not to share internet to other machines like a typical access point does.

[mariobehling]

@Orbiter said elsewhere we should compare this to our current implementation first before moving forward.

[hongquan]

@mariobehling Yes. And it is possible that our access point server is designed to work with an Android app, not for direct use in browser. I'm not sure because I haven't tested enough.