Remote Procedure Calls

Remote Procedure Calls, or RPC, are functions that can be called by other peers in the network. To create one, use the standard Godot's @rpc annotation before a function definition.

func _input(event: InputEvent) -> void:
	if event is InputEventKey:
		if event.keycode == KEY_E and event.is_pressed():
			_hello.rpc()

@rpc("any_peer", "reliable")
func _hello() -> void:
	print("hello!")

Example code, Press E to say hello!

To retrieve the RPC sender, use Godot's multiplayer.get_remote_sender_id(). CM.gd also provides additional functions to retrieve the RPC's caller. For example:

func _input(event: InputEvent) -> void:
	if event is InputEventKey:
		if event.keycode == KEY_E and event.is_pressed():
			_hello.rpc()

@rpc("any_peer", "reliable")
func _hello() -> void:
	print("hello from ", CM.rpc_sender_peer.peer_id)

Example code, Press E to say hello... and know who sent the message!

There are currently 2 provided CM shorthand:

• CM.rpc_sender_id get the RPC sender ID (same as multiplayer.get_remote_sender_id())
• CM.rpc_sender_peer get the RPC sender's CM Peer

For more details on RPC, check out Godot's Official Documentation