@dr_pub Yes a sort of API is enough and we have APIs already. We are going to restructure our MyControler completely in 2.x version, So I do not want to invest much time with the mobile application for 1.x version 2.x version will come with the mobile application.

thank you very much. it worked like you said. but as I need grouped graphs, I probably will (mis-)use the moisture variable type, so that I enter into the standard variables of mysensors. thanks again !