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I have done something similar and it was a pain and not super reliable. I ended up switching to using a homekit outlet (mine is a Wemo) and connecting a relay to that. Most gates open by closing a 24V ac circuit. So the relay is powered by a 5v wall wart plugged into the homekit outlet. The 24V ac line is normally open, when the homekit outlet comes on it powers the relay which closes the circuit and opens the gate. This works reliably and is homekit compatible without tweaks. Shortcuts and automations are easily added. The relay was about $1.00 and the Wemo homekit outlet about $10.