I am playing around with the HTTP special station and noticed that both on and off commands are sent every minute. The manual explains which parameters are necessary but not how the stations behave. Is that periodical sending of the commands normal or did I configure something wrong?
The periodic resend is the default operation. This is to ensure the http station is kept in sync if a message goes missing. You can change the default in Options/Advanced so that only a single message is sent on the state transition.