This code should work but it doesn't.

Try this please: http://solder.almuramc.com/downloads/SGCraft-2.0.0-alpha-8.jar

It kinda works... but if you call that function again the dialling gets interrupted and the other gate cannot be dialed anymore and you get "targetbusy" even thought its clearly not busy.

Hello, can you ping me in discord please. I need a bunch more information on how you created this and what happens in specific steps.

Fixed in alpha 13+.