Socket emit event: https://socket.io/docs/v3/emit-cheatsheet/

	socket.emit('event', args)
		Event an aktuelle connection des aufrufenden Client
			sockets: {'event'(args){...}}
	socket.server.emit('event', args)
		Event an globale connections aller Clients
			sockets: {'/event'(args){...}}
	socket.server.to(socket.conn.id).emit('event', ...)
		Event an globale connections des aufrufenden Client
			sockets: {'/event'(args){...}}

