Just for sharing.
I tried to add repeaters to my network but the sensor didn't communicate with the repeaters and only tried to send to Gateway.
I realized that Iv'e fixed parent ID on each sensor because I have a problem with find parent on my sensors (this is why i ended up adding repeaters). So Iv'e changed it back to finding parent mode and the repeater is now communicating with sensors!

FYI

Work fine, I have changed the lib myconfig.h file and the lua file.
Removed MySensors plugin device from devices, updated the lua file on Vera.
Reloaded engine, Plugged the arduino serialGateway back again.
and flowed insturcations of Adding SerialGateWay again.
Work fine, however I still have issues with Gateway to recognize devices and reading and sending info to devices
I guess its a matter of power to the NRF24 radio, altough I use capasitor in between the 3.3v and gnd from the Nano, I think it's not enough.