@mfalkvidd
Unfortunatelly no change after adding capacitor 
Now I have bought NRF24L01 WITH Plus and I'm trying with them.
I have reinstalled from skratch everything.
Gateway and sensor are now ca. 3-4 meters appart.
Sketch on atmega328p (light sensor)
/**
* The MySensors Arduino library handles the wireless radio link and protocol
* between your home built sensors/actuators and HA controller of choice.
* The sensors forms a self healing radio network with optional repeaters. Each
* repeater and gateway builds a routing tables in EEPROM which keeps track of the
* network topology allowing messages to be routed to nodes.
*
* Created by Henrik Ekblad <henrik.ekblad@mysensors.org>
* Copyright (C) 2013-2015 Sensnology AB
* Full contributor list: https://github.com/mysensors/Arduino/graphs/contributors
*
* Documentation: http://www.mysensors.org
* Support Forum: http://forum.mysensors.org
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* version 2 as published by the Free Software Foundation.
*
*******************************
*
* REVISION HISTORY
* Version 1.0 - Henrik EKblad
*
* DESCRIPTION
* Example sketch showing how to measue light level using a LM393 photo-resistor
* http://www.mysensors.org/build/light
*/
// Enable debug prints to serial monitor
#define MY_DEBUG
// Enable and select radio type attached
#define MY_RADIO_NRF24
//#define MY_RADIO_RFM69
#include <MySensors.h>
#define CHILD_ID_LIGHT 15
#define LIGHT_SENSOR_ANALOG_PIN 0
unsigned long SLEEP_TIME = 30000; // Sleep time between reads (in milliseconds)
MyMessage msg(CHILD_ID_LIGHT, V_LIGHT_LEVEL);
int lastLightLevel;
void presentation()
{
// Send the sketch version information to the gateway and Controller
sendSketchInfo("Light Sensor", "1.0");
// Register all sensors to gateway (they will be created as child devices)
present(CHILD_ID_LIGHT, S_LIGHT_LEVEL);
}
void loop()
{
int16_t lightLevel = (1023-analogRead(LIGHT_SENSOR_ANALOG_PIN))/10.23;
Serial.println(lightLevel);
if (lightLevel != lastLightLevel) {
send(msg.set(lightLevel));
lastLightLevel = lightLevel;
}
sleep(SLEEP_TIME);
}
On raspberry
./configure --my-transport=nrf24 --my-gateway=serial --my-serial-is-pty --my-serial-pty=/dev/ttyUSB020
Serial on the sensor
114445 !TSM:FPAR:NO REPLY
114447 TSM:FPAR
114449 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
116457 !TSM:FPAR:FAIL
116459 TSM:FAIL:CNT=7
116461 TSM:FAIL:DIS
116463 TSF:TDI:TSL
176465 TSM:FAIL:RE-INIT
176467 TSM:INIT
176475 TSM:INIT:TSP OK
176477 TSM:FPAR
176479 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
178487 !TSM:FPAR:NO REPLY
178489 TSM:FPAR
178491 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
180499 !TSM:FPAR:NO REPLY
180501 TSM:FPAR
180503 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
182511 !TSM:FPAR:NO REPLY
182513 TSM:FPAR
182515 TSF:MSG:SEND,255-255-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
on raspberry
pi@RP3HA:~/MySensors $ sudo ./bin/mysgw -d
mysgw: Starting gateway...
mysgw: Protocol version - 2.2.0-beta
mysgw: MCO:BGN:INIT GW,CP=RNNG----,VER=2.2.0-beta
mysgw: TSF:LRT:OK
mysgw: TSM:INIT
mysgw: TSF:WUR:MS=0
mysgw: TSM:INIT:TSP OK
mysgw: TSM:INIT:GW MODE
mysgw: TSM:READY:ID=0,PAR=0,DIS=0
mysgw: MCO:REG:NOT NEEDED
mysgw: MCO:BGN:STP
mysgw: MCO:BGN:INIT OK,TSP=1
And on my home automation (home assistant)
2017-07-22 13:00:19 ERROR (Thread-13) [mysensors.gateway_serial] Unable to connect to /dev/ttyUSB020
Update:
After 15-20 minutes running the gateway I received following lines:
mysgw: TSF:SAN:OK
mysgw: TSM:READY:NWD REQ
mysgw: TSF:MSG:SEND,0-0-255-255,s=255,c=3,t=20,pt=0,l=0,sg=0,ft=0,st=OK:
