Worth noting - use MY_RFM69_NEW_DRIVER define... (2.3.2+)

#ifdef ESP8266
    // For RFM69
    #define MY_RADIO_RFM69
	#define MY_RFM69_NEW_DRIVER
    #define MY_RFM69_FREQUENCY  RFM69_868MHZ // Set your frequency here
    #define MY_IS_RFM69HW                    // Omit if your RFM is not "H"
    #define MY_RFM69_IRQ_PIN    D1
    #define MY_RFM69_IRQ_NUM    digitalPinToInterrupt(MY_RFM69_IRQ_PIN)
    #define MY_RFM69_CS_PIN     D8           // NSS. Use MY_RFM69_SPI_CS for older versions (before 2.2.0)
#endif

@monte True, eByte’s are legit, afaik. But still you’re encountering some problems. 2.4Ghz band is pretty messy. 315/433/868 are still better solution (more obsolete now)… requiring larger antenna, though.

You know what I did? Switched to RFM69. You know why? Because I couldn’t get the shit done with nRF24s. You don’t even know if you have real nRF or some counterfeits - that’s the real problem. You can buy HackRF One to sniff on 2.4GHz band, but that won’t tell you if your module is receiving anything.
Really, to spare you some time - give up on these.

Main problem (already "quickfix" solved) is completely new and incompatibile interrupt system implemented in new (post-2016) ATtinys. More flexible, but also coming with some problems when using Arduino-like code and few libraries. Other than that, due to completely new power management these features I don't tested yet, may not work properly...

Ok.
Some progress.
I've ATtiny 3227, so tested on it, with RFM69, works in IRQ mode ok.

How to use:

• download library from github & replace in-place in arduino user lib folder
• use SpenceKonde megaTinyCore for newest ATtiny support
• required define (non-standard) goes into main sketch file (.ino) before <include "MySensors.h> :

#define MY_RFM69_IRQ_PIN PIN_PA5
#ifdef MY_RFM69_IRQ_PIN
	#define MY_RFM69_IRQ_PORT_vect        PORTA_PORT_vect
#endif

https://github.com/Gobol/MySensors

Some advances made.

Library is compilable @ 3227, but stripped from IRQ functionality.

DevEnv: Microchip Studio & vMicro w/ Arduino 1.8.16

Tests ongoing...

Trying to adapt MyS to tiny3227.

• selfmade devbrd done.
• pickit4 as a programmer (UPDI) works from newest Arduino 1.8.16 with megaTinyCore added to board manager
• churning datasheets for HAL part adaptation.

It is still quite amount of work to be done, even before first successful compilation...

My repo depends on hardkernel's linux kernel, esp. 4.9.277. It won't work with kernels >4.9 for Odroid N2, because the developers left GPIO subsystem down (no IRQs, no /dev/gpiomem), and it only works partially...

@Norton yep, it works in polling mode (~1% of cpu).

Hello,

I've made necessary changes to MySensors 2.4.0-alpha in order to work on Odroid-N2 SBC running Ubuntu 21.04 with 5.13.0 kernel
Library would have worked if every reference to pin number was at least uint16_t (not uint8_t, like it is). That's because Odroid-N2 have >2^8 pin numbering, and GPIO ranges in 460-490 decimal.

I've made my fork@github and pushed odroid-n2 required changes version.
Using polling (non-IRQ) mysgw drains 1.0% cpu time.
Still waiting for interrupt issues to resolve with HK team - hopefully soon.

Github repo @ https://github.com/Gobol/MySensors

Maybe diggin a topic a bit, but as for June 2021 :

In library file MyHwSTM32.h one line seems to be lost :

#ifndef MyHwSTM32_h
#define MyHwSTM32_h

#include <IWatchdog.h>
#include <itoa.h>
#include <SPI.h>
#include <EEPROM.h>   <<--- this is necessary to compile agains BluePill

and something like this in platformio.ini

[env:bluepill_f103c8]
platform = ststm32
board = bluepill_f103c8
framework = arduino

upload_protocol = stlink
debug_port = stlink
debug_tool = stlink
monitor_speed = 115200
monitor_filters = time, default

Just to keep you entertained.
Cheerz.