Classical/legacy bonding process must somehow be initiated at the Node side. If the button cannot be used for some reason, another „event“ must be used. Because the Node is not bonded, it is not a part of the network yet and therefore no network command is usable to start bonding. One possibility is to connect to the Node in the DSM (DPA Service Mode) using the CATS tool and press the Bond button at IQRF IDE. Or you can implement you own secure peer-to-peer “Bonding command” at the Reset event in your Costom DPA Handler, etc.