driver/power/gude8031: Add Support for Gude 87-1210-18

The Gude Expert Power Control 87-1210-18 is a vertical 20 port power
distribution unit:
https://gude-systems.com/en/products/expert-power-control-87-1210/

It uses the same HTTP-API, as the Gude Power Control 8031 - but simply
has more ports.
This commit adds support and documentation for this device.

Loosing the restrictions on the `index` makes it possible to re-use this
driver.

Setting a non-existent port fails silently.
But getting a non-existent port will cause an exception.
I deem this behavior acceptable, since a new device will be tested
during hardware setup anyway.
So we do not need to check the actual number of ports during normal
operation.

Signed-off-by: Chris Fiege <cfi@pengutronix.de>

Author: SmithChart

doc/configuration.rst

@@ -182,7 +182,7 @@ Currently available are:
   Controls *Gude Expert Power Control 8008 PDUs* via a simple HTTP API.
 
 ``gude8031``
-  Controls *Gude Expert Power Control 8031 PDUs* via a simple HTTP API.
+  Controls *Gude Expert Power Control 8031 PDUs* and *Gude Expert Power Control 87-1210-18 PDUs* via a simple HTTP API.
 
 ``gude8225``
   Controls *Gude Expert Power Control 8225 PDUs* via a simple HTTP API.

labgrid/driver/power/gude8031.py

@@ -1,23 +1,26 @@
 import requests
 
 # Driver has been tested with:
-# Gude Expert Power Control 8031()
+# * Gude Expert Power Control 8031()
+# * Gude Expert Power Control 87-1210-18
+#   This device needs to be used in 'Basic Compatible' mode for HTTP GET
+#   to be usable. Do not turn on session authentication.
 
 # HTTP-GET API is defined in the Gude EPC-HTTP-Interface specification:
 # http://wiki.gude.info/EPC_HTTP_Interface
 #
 # The `components=<N>` parameter defines which status information are
 # included into the returned JSON.
 # * `components=0` happily returns an empty response but still switches the
-#   outputs as requestd.
+#   outputs as requested.
 # * `components=1` only includes the output's state into the JSON.
 
 PORT = 80
 
 
 def power_set(host, port, index, value):
     index = int(index)
-    assert 1 <= index <= 8
+    assert 1 <= index <= 20
     # access the web interface...
     value = 1 if value else 0
     r = requests.get(f"http://{host}:{port}/status.json?components=0&cmd=1&p={index}&s={value}")
@@ -26,7 +29,7 @@ def power_set(host, port, index, value):
 
 def power_get(host, port, index):
     index = int(index)
-    assert 1 <= index <= 8
+    assert 1 <= index <= 20
 
     # get the component status
     r = requests.get(f"http://{host}:{port}/status.json?components=1")