Hi
I am an Electrical Engineer specialized in Computer Systems working in the field for last 3 years. My expertise are Python, C++, C#, Java & HTML. I have vast experience of doing projects on Raspberry Pi, Orange Pi, ESP8266, ESP32, Arduino and various microcontrollers.
Here is link to my portfolio where you can see overview of all the projects I have completed so far;
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I can provide you with the code, Circuit diagram and team viewer assistance (if required) for your application of listening to a command and opening the gate
In fact i have made an exact system like this before, there will be a motor connected to the gate/ or lock connected to the gate (depends on your requirement whether you need the gate to get unlock or open slidingly as its ambigious in the requirements), so when you send the command from Raspberry Pi, it will send the data to the respected pin of raspberrry pi and the gate will open
I have this system ready and i can provide it to your within 1 day.
If you have any additional requrements, i can provide you with them too, we can discuss them
if you like my work, and want to proceed, please contact me so that we can finalize after discussing details
Looking forward for your response
Mohsin