Thanks a lot it DID work.

but it is a pity luasocket libs for 5.2 have to be installed manually (5.1 libs are part of wheezy on rpi) .
How can we make this part of the Domoticz wiki ?

Hi,
on RPI with lua-socket/stable v3.0 installed a require ("socket.http") command in an lua script triggers the following message:
/usr/lib/arm-linux-gnueabihf/lua/5.1/socket/core.so: undefined symbol: luaL_openlib

however running the same script from the lua command line does not trigger the ...