Inconsistent user identification in recorder (maybe in owntracks in general?)

[fooryo]

First of all thank you for your project. I find it very well made.

I'm using owntracks via MQTT, my devices publish to owntracks/<mqttusername>/<deviceidentification>.
I'm playing around with the recorder and I needed to enter the payload encryption key somewhere (I found the ocat --load=keys cmd), turns out the username I needed to use was a bit different from the one of my intuition

1. Uppercase character in DeviceID (deviceidentification) are lowercased in recorder:
2. <mqttusername>/<deviceidentification> became <mqttusername>_<deviceidentification>

I imagined that if my mqttusrname is foo and my device name is barDEV the username for the recorder app should be foo/barDEV, well, it is not.

Is there a reason for these? MQTT limitation maybe?

[jpmens]

The reason simply is we lowercase usernames and devicenames, and this should be documented accordingly. If it isn't, it's a bug.