As far as I know, Homey apps can’t be used as a “generic” RF code receiver: you need to tell it the specifics of the code (timings, frame lengths, etc), and only then can you build an app around it.
Generic RF remotes typically the same chip (EV1527), however, their timing can vary widely, which poses a problem (because, again, Homey needs to know the timing up front).
A relatively quick and cheap solution would be to use a dedicated RF transceiver device, like the Sonoff RF Bridge, which can handle these different timings correctly. However, to get this working with Homey properly you need to flash a new firmware to the device, which requires some soldering and a USB-to-UART device (cheap, few € at most). Alternatively, there’s the Broadlink RM Pro+ device, which I believe can do the same.
At some point I want to try and create a generic EV1527 app (create a signal definition for each possible timing combination), but I already have a long TODO list 
