I'm so sorry for such late reply... the reason i wanted no for loop was to see how the code for that would turn out... I have a project in mind with requires maybe 2 switches and if one is turned on then regardless of the message coming from controller for the second light it should stay off...

Hi @SandeshHs94, welcome to MySensors :-) No changes are required for most examples No changes to the gateway is required when adding more sensors (unless you use signing with white listing). The gateway only forwards data to your controller, it does not care about what sensors it forwards data for. Yes, but only if you are running the development branch The API documentation is available here: http://www.mysensors.org/download/sensor_api_15