I nwas about talking about digispark (attiny85) board that would be a good match for rolling out mysensors if only had a couple more pins:

I was asking if it's possible to use them after all one way or another, at least for basic sensors with 3 pins (GND, Vcc, Signal) from which we need only Signal.
I also mentioned this as known, but unwated solution:
https://www.hackster.io/arjun/nrf24l01-with-attiny85-3-pins-74a1f2

YES, that's it, compiled and flashed... at which point the board started acting out, but I can bounce from here J
Thanks!
While we're still here, is there a way to connect 3-pin sensors (with one signal pin) to digisparks along with radio? 3-pin radio connection scheme is not an option at the moment unfortunately...
...and I feel like an idiot with a handful of those -)

Sketch notations were updated between 2.0 and 2.1.1, weren't they?

Cascading errors (

It seems that I needencoderTest:21: error: expected primary-expression before ',' token

 MyMessage msg(CHILD_ID, V_VAR1);

                       ^

C:\Users\Vadim\Documents\Arduino\encoderTest\encoderTest.ino: In function 'void setup()':

encoderTest:29: error: expected primary-expression before ',' token

     present(CHILD_ID, S_CUSTOM);

                     ^

exit status 1
expected primary-expression before ',' token

Rotary... line before mymessage is causing problems. I think I misunderstood its meaning

#include <SPI.h>
#define ROTARY_ANGLE_SENSOR A0

#define ADC_REF 5//reference voltage of ADC is 5v.If the Vcc switch on the seeeduino
                 //board switches to 3V3, the ADC_REF should be 3.3
#define VCC 5//VCC of the grove interface is normally 5v
#define FULL_ANGLE 300//full value of the rotary angle is 300 degrees
// Enable debug prints to serial monitor
#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define SN "RotaryAngleSensor"
#define SV "1.0"
#define CHILD_ID

#include <MySensors.h>

unsigned long SLEEP_TIME = 100;

Rotary Angle Sensor;

MyMessage msg(CHILD_ID, V_VAR1);
int lastDegrees;

void setup() 
{
    Serial.begin(9600);
    pinsInit();
    sendSketchInfo(SN, SV);
    present(CHILD_ID, S_CUSTOM);
}

void loop() 
{
    int degrees;
    degrees = getDegree();
    Serial.println(degrees);
    if (degrees != lastDegrees) {
        send(msg.set(degrees));
        lastDegrees = degrees;
    }
    
    sleep(SLEEP_TIME);
}

void pinsInit()
{
    pinMode(ROTARY_ANGLE_SENSOR, INPUT);
}

/************************************************************************/
/*Function: Get the angle between the mark and the starting position    */
/*Parameter:-void                                                       */
/*Return:   -int,the range of degrees is 0~300                          */
int getDegree()
{
    int sensor_value = analogRead(ROTARY_ANGLE_SENSOR);
    float voltage;
    voltage = (float)sensor_value*ADC_REF/1023;
    float degrees = (voltage*FULL_ANGLE)/VCC;
    return degrees;
}```

It was never used in fact, and it wasn't used in a reference sketch either. removing it killed only the top error message.

New error. Also is it normal that IDE recognizes nano board, but not its port?

WARNING: library GroveEncoder claims to run on [arc32] architecture(s) and may be incompatible with your current board which runs on [avr] architecture(s).
encoderTest:22: error: 'Rotary' does not name a type

 Rotary Angle Sensor;

 ^

encoderTest:24: error: expected primary-expression before ',' token

 MyMessage msg(CHILD_ID, V_VAR1);

                       ^

C:\Users\Vadim\Documents\Arduino\encoderTest\encoderTest.ino: In function 'void setup()':

encoderTest:32: error: expected primary-expression before ',' token

     present(CHILD_ID, S_CUSTOM);

                     ^

exit status 1
'Rotary' does not name a type

UPD: I forgot to paste the important part, this:

#error No forward link or gateway feature activated. This means nowhere to send messages! Pretty pointless.

I want to show angular value (0-300) upstream to Home Assistant as a sensor, and lockstep to it from there to control home assistant services - volume control, scene selector, media seek, etc.
Mysensors 2.11 in arduino, gateway is still 2.0. This is the sensor, not the same as encoder evidently:
http://wiki.seeed.cc/Grove-Rotary_Angle_Sensor/
and the code. Thanks!

#include <SPI.h>
#include <GroveEncoder.h>
#include <MyConfig.h>
#include <MySensors.h>
#define ROTARY_ANGLE_SENSOR A0

#define ADC_REF 5//reference voltage of ADC is 5v.If the Vcc switch on the seeeduino
                 //board switches to 3V3, the ADC_REF should be 3.3
#define VCC 5//VCC of the grove interface is normally 5v
#define FULL_ANGLE 300//full value of the rotary angle is 300 degrees
// Enable debug prints to serial monitor
#define MY_DEBUG 

// Enable and select radio type attached
#define MY_RADIO_NRF24
#define SN "RotaryAngleSensor"
#define SV "1.0"
#define CHILD_ID
unsigned long SLEEP_TIME = 100

Rotary Angle Sensor;

MyMessage msg(CHILD_ID, V_VAR1);
int lastDegrees;

void setup() 
{
    Serial.begin(9600);
    pinsInit();
    sendSketchInfo(SN, SV);
    present(CHILD_ID, S_CUSTOM);
}

void loop() 
{
    int degrees;
    degrees = getDegree();
    Serial.println(degrees);
    if (degrees != lastDegrees) {
        send(msg.set(degrees));
        lastDegrees = degrees;
    }
    
    sleep(SLEEP_TIME);
}

void pinsInit()
{
    pinMode(ROTARY_ANGLE_SENSOR, INPUT);
}

/************************************************************************/
/*Function: Get the angle between the mark and the starting position    */
/*Parameter:-void                                                       */
/*Return:   -int,the range of degrees is 0~300                          */
int getDegree()
{
    int sensor_value = analogRead(ROTARY_ANGLE_SENSOR);
    float voltage;
    voltage = (float)sensor_value*ADC_REF/1023;
    float degrees = (voltage*FULL_ANGLE)/VCC;
    return degrees;
}```