tplink: add support for kasa smart plugs

[threexc]

Description

• Extend the tplink resource definition to support smart plug devices like the HS103, in addition to the existing IotStrip functionality.
• Since these only have one port, make the index argument for NetworkPowerPort optional and default to 0 if not provided.
• Also update the docs to indicate that index is now optional.

Tested locally using both a KP303 strip (already supported) and an HS103. Here's the latter's kasa discover data:

(labgrid-venv) tgamblin@ecogrid:~/labgrid$ kasa discover                                                                                                                                           
Discovering devices on 255.255.255.255 for 10 seconds                                            
== workspace - HS103 ==                         
Host: 192.168.40.218                            
Port: 9999                                      
Device state: True                                                                               
Time:         2025-07-11 13:26:06-05:00 (tz: EST)
Hardware:     5.0 (US)                
Firmware:     1.0.13 Build 240117 Rel.162355                                                     
MAC (rssi):   98:25:4A:08:63:35 (-60)           

== Primary features ==
State (state): True

== Information ==
On since (on_since): 2025-07-11 13:13:31-05:00
Cloud connection (cloud_connection): True

== Configuration ==
LED (led): True                                                                                                                                                                                    

== Debug ==
RSSI (rssi): -60 dBm
Reboot (reboot): <Action>

And here is the sample exporter config:

thinkcentre:                                                                                                                                                                                       
  location: ecogrid                                                                                                                                                                                
  thinkcentre-kasa-plug:                                                                                                                                                                           
    cls: 'NetworkPowerPort'                                                                                                                                                                        
    model: 'tplink'                                                                                                                                                                                
    host: '192.168.40.218'

Checklist

• Documentation for the feature
• Tests for the feature - I think the existing tests may be adequate, but review would be good.
• The arguments and description in doc/configuration.rst have been updated
• PR has been tested

[threexc]

Pushed an update because I realized that the doc update didn't clarify that tplink now works for smart plugs too.

[codecov]

Codecov Report

❌ Patch coverage is 14.81481% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 45.3%. Comparing base (2daa13d) to head (f4f2fc1).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
labgrid/driver/power/tplink.py	11.5%	23 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff            @@
##           master   #1693     +/-   ##
========================================
- Coverage    45.4%   45.3%   -0.1%     
========================================
  Files         172     172             
  Lines       13503   13517     +14     
========================================
+ Hits         6131    6133      +2     
- Misses       7372    7384     +12     

Flag	Coverage Δ
3.10	45.3% <14.8%> (-0.1%)	⬇️
3.11	45.3% <14.8%> (-0.1%)	⬇️
3.12	45.3% <14.8%> (-0.1%)	⬇️
3.13	45.3% <14.8%> (-0.1%)	⬇️
3.9	45.4% <14.8%> (-0.1%)	⬇️

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[threexc]

Added a new test case in TestNetworkPowerDriver to test the index and make sure that the NetworkPowerDriver object still gets created OK if no index is provided.

[sjg20]

I'm not sure what can be done about testing, but otherwise this LGTM

[threexc]

A few rebases recently, no changes to the logic.

[threexc]

@Bastian-Krause @jluebbe anything holding this one back?

[threexc]

Just rebasing again, no new additions.

[threexc]

Rebased again.