For a test harness, I've been using the js8net package, which as of yet isn't installable via pip, so I just clone it locally. Test script:

import sys
sys.path.insert(0, '/Users/alb/Development/js8net')
from js8net import *
start_net("127.0.0.1", 2445)
set_speed(2)

Valid settings should return the speed set, e.g.:

>>> set_speed(2)
'2'

Invalid settings should return the current speed unchanged:

>>> set_speed(5)
'2'

Notes: this merged to rc/2.3.2 for inclusion in the merge to main.

Conflicts resolved.