Add client hotspot wwan connection handling

[spiccinini]

For multiple things it is useful to connect temporarily the device to an access point. To provide remote access/support through tmate or other means it is helpful that someone close to the device share its mobile phone connection to the router. The lime-app will use this functionality.
Enabling this functionality will provide "internet access" to the node only, not to other nodes of the network as the route won't be propagated. This is on purpose as acting as a default gateway may consume all the credit of a mobile connection.

Also the check-internet package now provides an optional (no new dependencies) ubus interface to check.

TODO:

• add tests

[ilario]

Nice!!
Sounds like similar to auto-usb-wwan but directly with the router's antennas, correct?
https://github.com/libremesh/lime-packages/tree/master/packages/auto-usb-wwan

How will the user enable the wwan on the LibreMesh node?

[spiccinini]

Nice!!
Sounds like similar to auto-usb-wwan but directly with the router's antennas, correct?
https://github.com/libremesh/lime-packages/tree/master/packages/auto-usb-wwan

How will the user enable the wwan on the LibreMesh node?

It can be done with the following (using radio1 instead of the default radio0)

root@LiMe-1efa02:~# echo | /usr/libexec/rpcd/lime-utils-admin call hostpot_wwan_is_connected
{"status":"ok","connected":false}

root@LiMe-1efa02:~# echo '{"radio": "radio1"}'  | /usr/libexec/rpcd/lime-utils-admin call hostpot_wwan_enable
{"status":"ok"}

root@LiMe-1efa02:~# echo | /usr/libexec/rpcd/lime-utils-admin call hostpot_wwan_is_connected
{"status":"ok","connected":true,"signal":-47}

root@LiMe-1efa02:~# echo  '{"radio": "radio1"}'  | /usr/libexec/rpcd/lime-utils-admin call hostpot_wwan_disable
{"status":"ok"}

root@LiMe-1efa02:~# echo | /usr/libexec/rpcd/lime-utils-admin call hostpot_wwan_is_connected
{"status":"ok","connected":false}

[codecov-commenter]

Codecov Report

Merging #890 (7befdb2) into master (8c41ceb) will increase coverage by 0.54%.
The diff coverage is 96.00%.

@@            Coverage Diff             @@
##           master     #890      +/-   ##
==========================================
+ Coverage   76.41%   76.95%   +0.54%     
==========================================
  Files          47       48       +1     
  Lines        3934     4057     +123     
==========================================
+ Hits         3006     3122     +116     
- Misses        928      935       +7     

Impacted Files	Coverage Δ
...lime-utils/files/usr/lib/lua/lime/hotspot_wwan.lua	95.40% <95.40%> (ø)
...es/lime-system/files/usr/lib/lua/lime/wireless.lua	97.17% <100.00%> (+0.15%)	⬆️
tests/fakes/iwinfo.lua	97.11% <100.00%> (+0.05%)	⬆️
...kages/lime-system/files/usr/lib/lua/lime/utils.lua	81.06% <0.00%> (-0.30%)	⬇️
tests/utils.lua	98.95% <0.00%> (+0.09%)	⬆️
...-utils/files/usr/lib/lua/lime/wireless_service.lua	60.53% <0.00%> (+2.28%)	⬆️

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 8c41ceb...7befdb2. Read the comment docs.

[luandro]

Well tested and simple logic. Great work ;)