I try to transmit / receive a coded message but that can not be reproduced, to open my gate, garage, door etc ...
NodeRed runs on my RPI and runs my house. A 433MHz transceiver is connected to its serial port.
(It allows me to communicate with many sensors everywhere in the house and in the garden).
Another transceiver connected to an Arduino in a remote control, detects a push button. He transmits a rolling code to the RPI who deciphers it and opens the portal.
Do you have an idea ?