After I bought RFlink I you simple transmiter and receiver devices like this:
https://pl.aliexpress.com/item/315-Mhz- ... 88047.html
and library on the Pi :
[url]git://git.drogon.net/wiringPi[/url]
I could send/receiver some number like this:
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sudo ./codesend 6666666
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sudo ./send systemCode unitCode command