I have two Attiny85 communicating over 433mhz radio (Rx & Tx on either ends) using virtual wire library, how will the programming be to pair them by the press of a button on either module ? i have so far been able to pair them both through the program (exclude any external devices by giving a node ID to listen to in my Rx) or think of adding DIP switches (but i run out of pins & combinations sooner). I am expecting something similar to a commercial product where i can connect multiple Tx modules to a single Rx base station in a press of a button on the Tx side. so i am seeking some technical expertise on the idea to understand such programming technique/methods.

Regardless of using 433mhz or a NRF24L01 module or anything else, i want to know how this feature of pairing module together is made.

I am a mechanical engineer by profession, with a hobby towards programming & electronics, so kindly spare some patience/detail in explaining this concept/technique.

I have two Attiny85 communicating over 433mhz radio (Rx & Tx on either ends) using virtual wire library, how will the programming be to pair them by the press of a button on either module ? i have so far been able to pair them both through the program (exclude any external devices by giving a node ID to listen to in my Rx) or think of adding DIP switches (but i run out of pins & combinations sooner). I am expecting something similar to a commercial product where i can connect/pair multiple Tx modules to a single Rx base station in a press of a button on the Tx side. so i am seeking some technical expertise on the idea to understand such programming technique/methods.

Regardless of using 433mhz or a NRF24L01 module or anything else, i want to know how this feature of pairing module together is made.

------ Edit 22 July 2021: This is added here in response from Crisl's comment

you have correctly understood my question, yes i want to learn how such a pairing protocol is implemented, i am not too concerned about the device for the communication gateway.

this question is regarding the protocol, and not about a specific circuit

------ I am a mechanical engineer by profession, with a hobby towards programming & electronics, so kindly spare some patience/detail in explaining this concept/technique.

I have two Attiny85 communicating over 433mhz radio (Rx & Tx on either ends) using virtual wire library, how will the programming be to pair them by the press of a button on either module ? i have so far been able to pair them both through the program (exclude any external devices by giving a node ID to listen to in my Rx) or think of adding DIP switches (but i run out of pins & combinations sooner). I am expecting something similar to a commercial product where i can connect multiple Tx modules to a single Rx base station in a press of a button on the Tx side. so i am seeking some technical expertise on the idea to understand such programming technique/methods. I am a mechanical engineer by profession, with a hobby towards programming & electronics, so kindly spare some patience/detail in explaining.

I have two Attiny85 communicating over 433mhz radio (Rx & Tx on either ends) using virtual wire library, how will the programming be to pair them by the press of a button on either module ? i have so far been able to pair them both through the program (exclude any external devices by giving a node ID to listen to in my Rx) or think of adding DIP switches (but i run out of pins & combinations sooner). I am expecting something similar to a commercial product where i can connect multiple Tx modules to a single Rx base station in a press of a button on the Tx side. so i am seeking some technical expertise on the idea to understand such programming technique/methods.

Regardless of using 433mhz or a NRF24L01 module or anything else, i want to know how this feature of pairing module together is made.

I am a mechanical engineer by profession, with a hobby towards programming & electronics, so kindly spare some patience/detail in explaining this concept/technique.