The msg is being substituted if you look (and scroll way to the right) at the last line in the rule.
( http://192.168.1.194/Dev/stLogger.php?devID=HotTub&fName=Hottub&ext=csv&srtOrder=0&logMsg=2022-05-08,11:43,147.4,104,16
)
That said, I have tried removing %msg% all together and hard coding the url with a made up msg.
i.e &logMsg=ThisHasNoSpaces Made no difference. Very puzzling
