Add support for LinkPi SmartHUB power port

[Kwiboo]

Description
LinkPi SmartHUB is a 12-port USB3.0 HUB utilizing four RTS5411 USB3.0 4-port HUB controllers, a FT232R USB UART IC and a STM32F103RB MCU for port power control. Maximum output power of each USB port is up to 15W.

Add a LinkPiSmartHUBPowerPort resource and a LinkPiSmartHUBPowerDriver with an accompanying linkpismarthub agent to support power on/off the ports of the LinkPi SmartHUB using a simple line-based protocol over a serial port.

Known commands:

• onoff <port> <1|0> - switch port power on/off
• state - get current power state of all ports
• SetOWP <1|0> <1|0> ... - set the power-on state of all ports
• GetOWP - get the power-on state of all ports

Responses are in JSON format, e.g.:

> onoff 5 1
< {"Cmd":"OnOffResp","SeqNum":1,"ret":0}
> state
< {"Cmd":"StateResp","SeqNum":2,"state":[0, 0, 0, 0, 0, 1, 0, 0, 0, 0, 0, 0]}
> SetOWP 0 0 0 0 0 0 0 0 0 0 0 1
< {"Cmd":"SetOWPResp","SeqNum":3,"ret":0}
> GetOWP
< {"Cmd":"GetOWPResp","SeqNum":4,"owp":[0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1]}

A version announcement is continuously sent every second:

< {"Cmd":"VerResp","ver":"SmartHUB_<ver>","uid":"<uid>"}

Please note that the port name printed on the hub does not match the internal port index used with the commands.

Links

Information on the LinkPi SmartHUB is hard to find, following links mention it:

• https://www.yuque.com/linkpi/encoder/lpx01gqitlpfiy2q#nnyqE
• https://www.yuque.com/linkpi/encoder/rlzly3ger34w5hks

Checklist

• Documentation for the feature
• Tests for the feature
• The arguments and description in doc/configuration.rst have been updated
• PR has been tested

[codecov]

Codecov Report

❌ Patch coverage is 86.86869% with 13 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.5%. Comparing base (b94e172) to head (658a1ef).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/remote/exporter.py	0.0%	7 Missing ⚠️
labgrid/remote/client.py	0.0%	3 Missing ⚠️
labgrid/driver/powerdriver.py	97.4%	1 Missing ⚠️
labgrid/resource/suggest.py	0.0%	1 Missing ⚠️
labgrid/resource/udev.py	93.3%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1729     +/-   ##
========================================
+ Coverage    45.2%   45.5%   +0.3%     
========================================
  Files         174     175      +1     
  Lines       13752   13850     +98     
========================================
+ Hits         6224    6310     +86     
- Misses       7528    7540     +12     

Flag	Coverage Δ
3.10	45.5% <86.8%> (+0.3%)	⬆️
3.11	45.5% <86.8%> (+0.3%)	⬆️
3.12	45.5% <86.8%> (+0.3%)	⬆️
3.13	45.5% <86.8%> (+0.3%)	⬆️
3.14	45.5% <86.8%> (+0.3%)	⬆️
3.9	45.6% <86.8%> (+0.3%)	⬆️

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