Tried to test with a Windows laptop to exclude the RPI. I used a script from http://www.smartmeterdashboard.nl/ named "P1NET Datalogger V7.rar". unfortunately that script is showing an error: C:\p1>p1.py -c 3 -v 4 P1.py v0.73b Windows Mode Python version 3.5.1 Control-C to abort Startup parameters ...

Suddenly P1 is not showing any values. 433 mhz hardware and S0 hardware are working fine. No errors in the Domoticz log. P1 device is shown when using the command "ls -l /dev/tty*" But no data is shown if I use the command "cat /dev/ttyP1". When using the command "cat /dev/ttyS0" correct values are ...

I was very skeptical about the tip from Skippiemanz but it solved my problem......

Same error in my log file: LUA: current is 0 or nil. Skipping this reading. The json statement for the hygrometer in my badroom http://192.168.1.29:8080/json.htm?type=devices&rid=459 gives the following output: { "ActTime" : 1439407102, "ServerTime" : "Aug 12 2015 21:18:22", "Sunrise" : "06:14:00 ...