(SOLVED)
PROBLEM CAUSE: some sort of unclear data in the memory of the board(sparkfun redboard), i think..
SOLUTION: uploading mock-sensor sketch and afterwards the wanted sketch
i soldered the de-CAP and tried within 2 meters range, but it didnt change.
than i got back to my office and uploaded serial gateway sketch to one board while the other board was still with repeater sketch.
the serial gateway showed correct log at the IDE like in the thread that Wijbe-Fryslan mentioned, but the repeater still didnt receive its data.
than i uploaded mock-sensor sketch to the second board and than the data appeared at the serial gateway log.
so i did the same procedure of uploading mock sketch , and than uploading the wanted sketch for each board (repeater and humidity) and went to the controller to check it and it worked!! thanks to the new original domoticz app i could check the log online for "sketch version" lines and afterwards i did reception distance metering with battery powered repeater node.
now all is working fine but there is something that disturbs me - the domoticz log showed same node number for the repeater and the new humidity sketch. is that ok? or i should define manual node number inside the sketch?
HUGH THANKS TO EVERYBODY