Esp8266 and relay: how to be sure

[lucalg]

Good morning, sorry if i'm posting something already present somewhere here. I've done a deep search before posting, but no way.

Let me say before all that i'm not a programmer so I tryed all present in domoticz to exclude the code.

Scenario:
1. I need to command a relay connected to Esp8266
2. I've created dummy sensor and I'm using ONACTION and OFFACTION inside switch to send command http://192.168.1.94/control?cmd=GPIO,15,1
3. we used repeater to send wifi better as we can but, checking logs, I can see some Off states.
4. this problem is making all my structure unstable, because sending commands by this way I have domoticz switch powering on without any insurance has been received from the destination.

I can't find any solution, so please help me if you can.
Tnx,
Luca