To follow up. It was hardware: broken vcc pin on the dht11 corrupted the whole sensor code badly. Resolder and added wait-code, inverted the on-off 0-vs-1 and I have a good working sensor. The duplicate is also installed and working reliably.
A 6-relay board is also working nicely and Domoticz is great. My old system is nearly replaced and I couldnt be happier.
Respect and thanks all around!
I have now. I always have that nagging feeling...
But after MANY iterations, finally success. At least partly. 
BlinkWithoutDelay works AND mysensors sketch as well (will do more testing...).
What made it work, if anyone else struggles with this:
-connect uno (to computer-linux), board:uno, upload ArduinoISP, disconnect
-add shield to uno and atmega328p-pu to shield, connect to computer, board: "8mhz on breadboard", "programmer: "Arduino as ISP", burn bootloader, disconnect
-board: Uno, connect as above, "upload sketch using programmer", disconnect EDIT this last part appears to work but internal clock is all messed up. Bootloader works fine like this.
The magic happened after I changed the board back to Uno after burning bootloader. Why is beyond me, but maybe some arduino-ninja can figure it out.
@gohan N00b question, but which steps from the step-by-step need to be redone to "compile it" after altering myconfig.h? Or can you just post the command lines? 
Nevermind. Whined too soon.
Completely worked over the node4 code, moved "include"s around and eventually changed the relay presentations and receive clauses. Hope this helps someone with their problems later:
Thanks a millions!
void before()
{
// Set relay pin in output mode
pinMode(RELAY_1, OUTPUT);
// Set relay to last known state (using eeprom storage)
digitalWrite(RELAY_1, loadState(CHILD_ID_RELAY)?RELAY_ON:RELAY_OFF);
}
later this....
present(CHILD_ID_RELAY, S_BINARY);
....and ending with this...
void receive(const MyMessage &message)
{
if (message.type==V_STATUS) {
if (message.destination == MY_NODE_ID) { // Only switch the relay if the message is for this node
Serial.print("Updating relay state");
// Change relay state
digitalWrite(RELAY_1, message.getBool()?RELAY_ON:RELAY_OFF);
// Store state in eeprom
saveState(CHILD_ID_RELAY, message.getBool());
// Write some debug info
}
// Write some debug info
Serial.print("Incoming change for sensor:");
Serial.print(message.sensor);
Serial.print(", New status: ");
Serial.println(message.getBool());
}
}
@anticimex I've built a new node, DHT11 that sends temp&hum data. I reconfigured Rpi with this:
sudo ./configure --my-transport=nrf24 --my-rf24-irq-pin=15 --my-signing-debug --my-signing=password --my-signing-password=XXXXXX --my-gateway=mqtt --my-controller-ip-address=127.0.0.1 --my-mqtt-user=YYYY --my-mqtt-password=ZZZZZ --my-mqtt-publish-topic-prefix=mysensors-out --my-mqtt-subscribe-topic-prefix=mysensors-in --my-mqtt-client-id=mygateway1 --my-leds-err-pin=12 --my-leds-rx-pin=16 --my-leds-tx-pin=18
This is what I get in gw syslog:
Apr 2 22:53:11 DietPi mysgw: Starting gateway...
Apr 2 22:53:11 DietPi mysgw: Protocol version - 2.2.0
Apr 2 22:53:11 DietPi mysgw: MCO:BGN:INIT GW,CP=RNNGLSQX,VER=2.2.0
Apr 2 22:53:11 DietPi mysgw: !SGN:BND:PWD<8
Apr 2 22:53:11 DietPi mysgw: !SGN:INI:BND FAIL
Apr 2 22:53:11 DietPi mysgw: TSF:LRT:OK
Apr 2 22:53:11 DietPi mysgw: TSM:INIT
Apr 2 22:53:11 DietPi mysgw: TSF:WUR:MS=0
Apr 2 22:53:11 DietPi mysgw: TSM:INIT:TSP OK
Apr 2 22:53:11 DietPi mysgw: TSM:INIT:GW MODE
Apr 2 22:53:11 DietPi mysgw: TSM:READY:ID=0,PAR=0,DIS=0
Apr 2 22:53:11 DietPi mysgw: MCO:REG:NOT NEEDED
Apr 2 22:53:11 DietPi mysgw: MCO:BGN:STP
Apr 2 22:53:11 DietPi mysgw: MCO:BGN:INIT OK,TSP=1
Apr 2 22:53:11 DietPi mysgw: GWT:RMQ:MQTT RECONNECT
Apr 2 22:53:11 DietPi mysgw: connected to 127.0.0.1
Apr 2 22:53:11 DietPi mysgw: GWT:RMQ:MQTT CONNECTED
Apr 2 22:53:11 DietPi mysgw: GWT:TPS:TOPIC=mysensors-out/0/255/0/0/18,MSG SENT
Apr 2 22:53:23 DietPi mysgw: TSF:MSG:READ,99-99-255,s=255,c=3,t=7,pt=0,l=0,sg=0:
Apr 2 22:53:23 DietPi mysgw: TSF:MSG:BC
Apr 2 22:53:23 DietPi mysgw: TSF:MSG:FPAR REQ,ID=99
Apr 2 22:53:23 DietPi mysgw: TSF:PNG:SEND,TO=0
Apr 2 22:53:23 DietPi mysgw: TSF:CKU:OK
Apr 2 22:53:23 DietPi mysgw: TSF:MSG:GWL OK
Apr 2 22:53:23 DietPi mysgw: SGN:SKP:MSG CMD=3,TYPE=8
Apr 2 22:53:23 DietPi mysgw: TSF:MSG:SEND,0-0-99-99,s=255,c=3,t=8,pt=1,l=1,sg=0,ft=0,st=OK:0
Apr 2 22:53:25 DietPi mysgw: TSF:MSG:READ,99-99-0,s=255,c=3,t=24,pt=1,l=1,sg=0:1
Apr 2 22:53:25 DietPi mysgw: SGN:SKP:MSG CMD=3,TYPE=24
Apr 2 22:53:25 DietPi mysgw: TSF:MSG:PINGED,ID=99,HP=1
Apr 2 22:53:25 DietPi mysgw: SGN:SKP:MSG CMD=3,TYPE=25
Apr 2 22:53:25 DietPi mysgw: TSF:MSG:SEND,0-0-99-99,s=255,c=3,t=25,pt=1,l=1,sg=0,ft=0,st=OK:1
Apr 2 22:54:18 DietPi mysgw: TSF:MSG:READ,99-99-0,s=1,c=3,t=16,pt=0,l=0,sg=0:
Apr 2 22:54:18 DietPi mysgw: SGN:SKP:MSG CMD=3,TYPE=16
Apr 2 22:54:18 DietPi mysgw: !SGN:NCE:GEN
Apr 2 22:54:23 DietPi mysgw: TSF:MSG:READ,99-99-0,s=0,c=3,t=16,pt=0,l=0,sg=0:
Apr 2 22:54:23 DietPi mysgw: SGN:SKP:MSG CMD=3,TYPE=16
Apr 2 22:54:23 DietPi mysgw: !SGN:NCE:GEN
This is kicking my butt... I cant understand that last part about the nonce 
I will add the code from the node as soon as possible.
Just a quick idea: are you powering the RFM69 from the Rpi?
I use a Rpi Zero W and when I powered my radio NRF24 from that it doesnt get enough juice even with caps.
I now use a bigger USB-wall wart and use AMS1117-3.3 to power the radio (PA-version) and added caps.
My two cents
@mfalkvidd Made the password 10 characters. From looks of the logs, it's working now.
I cant believe I skipped the step of making the password longer... Just got too fixated on the password I came up with.
Apparently sleeping less and debugging late solves problems. This is SOLVED.
My IDE library was outdated. I updated my Arduino Mysensors-library, upload to one node, and my node started to communicate fine. Must reupload all nodes unfortunately. Probably the problems are caused by signing differences in previous library versions vs. 2.3.0 release for Raspberry.
Again, hope this helps someone who encounters the same problem.
@rozpruwacz Got lucky and found an extra W5100 without the 100ohm resistors. Also disabled the static ip (I set it from the routers ip table instead).
Now, it seems the gw is breathing..
I had weird problems as well. My W5100 module was at fault.
One module needed resistors and one didn't. I never figured out the problem. I also had what seemed a good ethernet but weird connection problems.
Check this thread out, just in case it helps.
https://forum.arduino.cc/index.php?topic=351477.msg3215306#msg3215306
@Yveaux and @boum You two beat me by 2hrs.
@user2684 whose code this is (cudos to him, have used this bit on a number of sensors!) had probably figured that out and I screwed myself when I changed the original analogRead to int.
Now the whole thing works 100%
I dont know what controller you are using but I had similar problems with domoticz when presenting s_light_level and V_Level vs v_light_level. It had to do with domoticz update.
Thats what came to mind. I didnt find a sketch problem if this wasn't part of your problem.
@electrik Thanks I'll check those.
I added a lot of serial.Print's to debug where it goes south and it appears to ruin already at the first division after the analogRead (I started receiving 530's analogRead at room temp). So probably something else completely that's rotten. I'll try another machine with another Arduino IDE. It should work now that the original question is answered.
So I'll consider this solved. Thanks again!
@electrik ..and then just adjust the volts/bit for 3.3 rather than 1.1v, correct? (i.e x3). That fixed it, thank you.
BUT presented a weird problem. The analogRead gives a proper value but the math then is not working and I cant figure it out. I did the calculations myself and get a proper result:
int _nominal_resistor2 = 10000;
int _nominal_temperature2 = 25;
int _b_coefficient2 = 3950;
int _series_resistor2 = 10000;
int adcTmm = analogRead(THMR_PIN);
Serial.println(adcTmm);
float readingSau = (1023 / adcTmm) - 1;
readingSau = _series_resistor2 / readingSau;
float temperatureS = readingSau / _nominal_resistor2; // (R/Ro)
temperatureS = log(temperatureS); // ln(R/Ro)
temperatureS /= _b_coefficient2; // 1/B * ln(R/Ro)
temperatureS += 1.0 / (_nominal_temperature2 + 273.15); // + (1/To)
temperatureS = 1.0 / temperatureS; // Invert
temperatureS -= 273.15; // convert to C
send(msgTempSau.set((int16_t)temperatureS, 2));
Serial.print("Sauna T: ");
Serial.print(temperatureS);
Serial.println(" C");
But still the serial monitor shows:
7409 MCO:SLP:WUP=1
7413 TSF:TRI:TSB
Sauna door: 1
7430 TSF:MSG:SEND,21-21-10-0,s=3,c=1,t=16,pt=0,l=1,sg=0,ft=0,st=OK:1
7966 TSF:MSG:SEND,21-21-10-0,s=1,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:29.00
Shower T: 29.00
7989 TSF:MSG:SEND,21-21-10-0,s=0,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=OK:87.0
Shower H: 87.00
536
8005 TSF:MSG:SEND,21-21-10-0,s=16,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:-273.00
Sauna T: -273.15 C
Sauna off, sleeping 30min
Battery Voltage: 4.22 V Battery percent: 97.70 %
8028 TSF:MSG:SEND,21-21-10-0,s=255,c=3,t=0,pt=1,l=1,sg=0,ft=0,st=OK:97
8097 MCO:SLP:MS=1800000,SMS=0,I1=1,M1=1,I2=255,M2=255
8108 TSF:TDI:TSL
I changed variable names to account there wouldnt be overlap with DHT library & dht part of sketch.
I investigated the bootloader problem, I use 1.8.1 definitions that made those problems disappear. But still, the A2 (THMR_PIN) reads 1023 but the battery sense on A4 works.
EDIT: now I get what you mean: it also changes the reference for the whole ADC...from 3.3 to 1.1V! Any ideas for changing the resistors? I would want to use the same thermistor as I only have two wires going to the sauna. OR is there a way to change the reference for A2 read and go back after it's been read?
Same result float => int change in the sketch.
Tried to reupload bootloader but got a problem, same with another atmega328. Will investigate that next.
I have troubleshot this for over a week but can't figure it out.
My A1 & A2 wont analogRead anything except 1023, however my battery sensing works on A4. I'm using a SlimNode pcb, an AtMega328 barebone with 8mhz bootloader. The pcb is powered by 18650 with protection board (gets power from mains when lights are on and charges). The A2 has a thermistor in a voltage divider config (VCC3V3 - R10k - A2 - thermistor - GND) and reading the voltage at A2 is 1.73'ish and 3.3 at VCC.
Sketch:
#define MY_DEBUG // Enable debug prints to serial monitor
#define MY_RADIO_RF24 // Enable and select radio type attached
#define MY_TRANSPORT_WAIT_READY_MS 3000 //set how long to wait for connection to establish before moving on. in milliseconds
#define MY_NODE_ID 21
#define MY_BAUD_RATE 57600
#define DOOR 3
#define DHT_DATA_PIN 5
#define CHILD_ID_HUM 0
#define CHILD_ID_TEMP 1
#define THMR_PIN A2 // A2/16 pin
#define LED 7
#define SENSOR_TEMP_OFFSET 0
#include <SPI.h>
#include <MySensors.h>
#include <DHT.h>
int BATTERY_SENSE_PIN = A4;
float lastTemp;
float lastHum;
uint8_t nNoUpdatesTemp;
uint8_t nNoUpdatesHum;
bool metric = true;
unsigned long previousMillis = 0;
long sleepTime;
int oldBatteryPcnt = 0;
MyMessage msgHum(CHILD_ID_HUM, V_HUM);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
MyMessage msgTempSau(THMR_PIN, V_TEMP);
MyMessage msgDoor(DOOR, V_TRIPPED);
DHT dht;
void presentation()
{
sendSketchInfo("SaunaTempsDoor", "v29032020");
// Register all sensors to gw (they will be created as child devices)
present(CHILD_ID_HUM, S_HUM, "Shower Hum");
present(CHILD_ID_TEMP, S_TEMP, "Shower Temp");
present(THMR_PIN, S_TEMP, "Sauna Temp");
present(DOOR, S_DOOR);
metric = getControllerConfig().isMetric;
}
void setup()
{
dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
sleep(2000);
// pinMode(THMR_PIN, INPUT);
pinMode(DOOR, INPUT_PULLUP);
pinMode(LED, OUTPUT);
// pinMode(BATTERY_SENSE_PIN, INPUT);
for (int i=0; i<6; i++){
digitalWrite(LED, HIGH);
delay(200);
digitalWrite(LED, LOW);
delay(200);
}
analogReference(INTERNAL);
}
void loop()
{
// Check the door
bool doorState = !digitalRead(DOOR);
Serial.print("Sauna door: ");
Serial.println(doorState);
send(msgDoor.set(doorState?"1":"0")); // Send tripped value to gw
// Check DHT-sensor
delay(300);
dht.readSensor(true);
float temperature = dht.getTemperature();
if (isnan(temperature)) {
Serial.println("Failed reading temperature from DHT!");
}
else {
lastTemp = temperature;
send(msgTemp.set(temperature, 2));
Serial.print("Shower T: ");
Serial.println(temperature);
}
float humidity = dht.getHumidity();
if (isnan(humidity)) {
Serial.println("Failed reading humidity from DHT");
}
else {
lastHum = humidity;
send(msgHum.set(humidity, 1));
Serial.print("Shower H: ");
Serial.println(humidity);
}
// Read the thermistor
int _nominal_resistor = 10000;
int _nominal_temperature = 25;
int _b_coefficient = 3950;
int _series_resistor = 10000;
delay(10);
float adcT1 = analogRead(THMR_PIN);
Serial.println(adcT1);
float reading1 = (1023 / adcT1) - 1;
reading1 = _series_resistor / reading1;
float temperatureS;
temperatureS = reading1 / _nominal_resistor; // (R/Ro)
temperatureS = log(temperatureS); // ln(R/Ro)
temperatureS /= _b_coefficient; // 1/B * ln(R/Ro)
temperatureS += 1.0 / (_nominal_temperature + 273.15); // + (1/To)
temperatureS = 1.0 / temperatureS; // Invert
temperatureS -= 273.15; // convert to C
send(msgTempSau.set((int16_t)temperatureS, 2));
Serial.print("Sauna T: ");
Serial.print(temperatureS);
Serial.println(" C");
if (temperatureS > 40){
sleepTime = 300000; // 5min when sauna is hot
Serial.println("Sauna warm, sleeptime 5min");
}
else {
sleepTime = 1800000; // 30min sleep when sauna is <40C
Serial.println("Sauna off, sleeping 30min");
}
// get the battery Voltage
int sensorValue = analogRead(BATTERY_SENSE_PIN);
// 1M & 200k => Vmax = 6.6 Volts => Volts per bit = 0.00645161290323
float batteryV = sensorValue * 0.00645161290323;
Serial.print("Battery Voltage: ");
Serial.print(batteryV);
Serial.print(" V ");
float batteryPcnt = ( (batteryV - 3) / 1.25) * 100;
Serial.print("Battery percent: ");
Serial.print(batteryPcnt);
Serial.println(" %");
if (oldBatteryPcnt != batteryPcnt) {
sendBatteryLevel(batteryPcnt);
oldBatteryPcnt = batteryPcnt;
}
digitalWrite(LED, HIGH);
delay(50);
digitalWrite(LED, LOW);
sleep(1, CHANGE, sleepTime); // Wake to door switch or sleeptime
}
And debug from serial (NO errors etc along the way, sketch uses 60%mem)
17205 MCO:SLP:WUP=1
17209 TSF:TRI:TSB
Sauna door: 0
17219 TSF:MSG:SEND,21-21-9-0,s=3,c=1,t=16,pt=0,l=1,sg=0,ft=0,st=OK:0
17555 TSF:MSG:SEND,21-21-9-0,s=1,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:24.00
Shower T: 24.00
17573 TSF:MSG:SEND,21-21-9-0,s=0,c=1,t=1,pt=7,l=5,sg=0,ft=0,st=OK:16.0
Shower H: 16.00
1023.00
17604 TSF:MSG:SEND,21-21-9-0,s=16,c=1,t=0,pt=7,l=5,sg=0,ft=0,st=OK:-273.00
Sauna T: -273.15 C
Sauna off, sleeping 30min
Battery Voltage: 4.31 V Battery percent: 104.77 %
17627 TSF:MSG:SEND,21-21-9-0,s=255,c=3,t=0,pt=1,l=1,sg=0,ft=0,st=OK:104
17696 MCO:SLP:MS=1800000,SMS=0,I1=1,M1=1,I2=255,M2=255
17707 TSF:TDI:TSL
The reading from battery is correct (almost: multimeter says 4.23 at battery) how to fix this?
Why are my analogReads failing (I already switched from A1 to A2 just in case). I have checked the wiring twenty times.
Once the network works or I have the issue pinned down, I'll be happy to disable all extras. I noticed the weight of the signing and did the debugs one at a time in sequential uploads (time and two computers) to look for the problem.
So your bet is a memory problem at the core of my troubles?
If you like that, I'll happily respect your knowledge in this. And I'll see if it works with minimal moving parts.
I'm wrestling to get my network going.
If I remove the signing, it works perfectly. Once I add the signing, gw responses always end with "signing failed" and thus no connections.
I'm just going to show sketches for gw (LolinV3 NodeMcu1.0) and node (ProMini3.3V) and I will change the passwords and parameters once we figure this out. I will highlight the line that when commented in, causes signing failed. Always.
I did VERBOSE_SIGNING and _RFM69: no errors, only signature failed. Signal strength -55 - -70dBm and sig-noise -99. And no NACKs!
GW:
/*
* The ESP8266 MQTT gateway sends radio network data to your MQTT broker.
*
* LED purposes:
* - To use the feature, uncomment any of the MY_DEFAULT_xx_LED_PINs in your sketch
* - ERR (red) - fast blink on error during transmission error or receive crc error
* UPLOAD at 57600baud!
* Board: NodeMCU 1.0, 4M 1MSPIFFS
*/
#define MY_DEBUG
#define MY_BAUD_RATE 57600
#define MY_RADIO_RFM69
#define MY_RFM69_FREQUENCY RFM69_868MHZ // Set your frequency here
#define MY_IS_RFM69HW // Omit if your RFM is not "H"
#define MY_RFM69_NEW_DRIVER
#define MY_RFM69_NETWORKID 102
#define MY_RFM69_ENABLE_ENCRYPTION
#define MY_RFM69_IRQ_PIN 5 //GPIO 5 = D1
#define MY_RFM69_IRQ_NUM MY_RFM69_IRQ_PIN
#define MY_RFM69_CS_PIN 15 //GPIO 15 = D8
#define MY_GATEWAY_MQTT_CLIENT
#define MY_GATEWAY_ESP8266
//#define MY_SIGNING_SIMPLE_PASSWD "ollila2018" // <= PROBLEM THIS LINE
//#define MY_DEBUG_VERBOSE_SIGNING
#define MY_MQTT_PUBLISH_TOPIC_PREFIX "domoticz/in/mysenRFM69"
#define MY_MQTT_SUBSCRIBE_TOPIC_PREFIX "domoticz/out/mysenRFM69"
#define MY_MQTT_CLIENT_ID "mysenRFM69"
#define MY_MQTT_USER "zzzz"
#define MY_MQTT_PASSWORD "ZZZZZZZZ"
#define MY_WIFI_SSID "Xxxxxx"
#define MY_WIFI_PASSWORD "Yyyyyyyy"
#define MY_HOSTNAME "mqtt-ESP8266-gateway"
#define MY_CONTROLLER_IP_ADDRESS 192, 168, 1, 51 //MQTT ip
#define MY_PORT 1883 // MQTT port
#define MY_DEFAULT_LED_BLINK_PERIOD 300
// Flash leds on rx/tx/err
#define MY_DEFAULT_ERR_LED_PIN 16 // Error led pin D0 (GPIO 16)
#define MY_WITH_LEDS_BLINKING_INVERSE
#include <ESP8266WiFi.h>
#include <MySensors.h>
void setup()
NODE:
#define MY_DEBUG
#define MY_BAUD_RATE 57600
#define MY_RADIO_RFM69
#define MY_RFM69_FREQUENCY RFM69_868MHZ // Set your frequency here
#define MY_IS_RFM69HW // Omit if your RFM is not "H"
#define MY_RFM69_NEW_DRIVER
#define MY_RFM69_NETWORKID 102
#define MY_RFM69_ENABLE_ENCRYPTION
//#define MY_SIGNING_SIMPLE_PASSWD "ollila2018" // <== PROBLEM HERE
//#define MY_DEBUG_VERBOSE_RFM69
//#define MY_DEBUG_VERBOSE_SIGNING
#define MY_NODE_ID 51
#include <MySensors.h>
I'm starting to suspect a bug. I don't know what else could it be?
Also note, I have not changed MySensors.h or any "hard code"
I had weird problems as well. My W5100 module was at fault.
One module needed resistors and one didn't. I never figured out the problem. I also had what seemed a good ethernet but weird connection problems.
Check this thread out, just in case it helps.
https://forum.arduino.cc/index.php?topic=351477.msg3215306#msg3215306