I have checked with ethernet port instead of serial:

sudo ./configure --my-debug=enable --my-config-file=/etc/mysensors.conf --my-transport=rs485 --my-gateway=ethernet --my-port=5003 --my-rs485-de-pin=7 --my-rs485-serial-port=/dev/ttyS0 --my-rs485-baudrate=9600 --my-leds-err-pin=12 --my-leds-rx-pin=16 --my-leds-tx-pin=18

The results is:

1. The gateway works with nodes as expected - no need to hit Enter for updates. It works as daemon as well.
   So why it not works on gateway with serial? My suspicious is the port - I was using fake ones (/dev/ttyMySensorsGateway and /dev/ttyUSB020) and the real one /dev/ttyAMA0. Always the same. I tried to listen the (fake) port with "screen" command - nothing was there.

2. I have another finding/problem. When the gateway starts:

Sep 21 14:20:57 ERROR Failed to open log pipe.
Sep 21 14:20:57 INFO  Starting gateway...
Sep 21 14:20:57 INFO  Protocol version - 2.3.2
Sep 21 14:20:57 DEBUG MCO:BGN:INIT GW,CP=RSNGL---,FQ=NA,REL=255,VER=2.3.2
Sep 21 14:20:57 DEBUG TSF:LRT:OK
Sep 21 14:20:57 DEBUG TSM:INIT
Sep 21 14:20:57 DEBUG TSF:WUR:MS=0
Sep 21 14:20:57 DEBUG Serial port /dev/ttyS0 (9600 baud) created
Sep 21 14:20:57 DEBUG TSM:INIT:TSP OK
Sep 21 14:20:57 DEBUG TSM:INIT:GW MODE
Sep 21 14:20:57 DEBUG TSM:READY:ID=0,PAR=0,DIS=0
Sep 21 14:20:57 DEBUG MCO:REG:NOT NEEDED
Sep 21 14:20:57 DEBUG Listening for connections on F▒▒:5003
Sep 21 14:20:57 DEBUG MCO:BGN:STP
Sep 21 14:20:57 DEBUG MCO:BGN:INIT OK,TSP=1
Sep 21 14:20:57 DEBUG TSM:READY:NWD REQ
Sep 21 14:20:57 DEBUG ?TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=20,pt=0,l=0,sg=0,ft=0,st=OK:
Sep 21 14:21:10 DEBUG TSF:MSG:READ,50-50-0,s=0,c=1,t=23,pt=2,l=2,sg=0:58

... you can find that instead of IP address (I was expecting 127.0.0.0 or 0.0.0.0) I get a garbage:

DEBUG Listening for connections on F▒▒:5003

After another trial (make clean -> ./configure .... -> make I get similar but with different "garbage":

DEBUG Listening for connections on ▒ݾ:

Home Assistant is unable to find the gateway on ports 127.0.0.1 and 0.0.0.0. I tried local network IP (static) - it was "accepted" (no connection error returned), but no Nodes has been found.
I'm really stubborn to find single board solution for Gateway (RS485 nodes) and Controller but I'm getting tired :(.