RFXCOM: new user a bit puzzled with concepts (binary_sensors versus switches)

Dear all

I am a new user who managed to get HA running on a Synology NAS in combination with an RFXCOM USB unit to talk to a set of KlikAanKlikUit equipment (COCO?).

Having put the system in the mode where it adds equipment automatically, it seems to work fine. However, trying to understand what is going I am confused.

Whenever a KlikAanKlikUit apparatus is being switched, for example via a remote or a ICS2000 hub, I find two entries in the log book. For example one listed as binary_sensor and one listed as switch. Since I have always understood KlikAanKlikUit to be unidirectional, i.e. the receiving end does not send confirmations, this leaves me puzzled: if one of the events is related to the trigger, what generates the other one?

Frank