SOLVED..... Such a mug, such a small error. One character missing in wireless key.

NODE CODE
#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_NODE_ID 66
#include <SPI.h>
#include <MySensors.h>
#include <Bounce2.h>
#define RELAY_PIN 7
#define BUTTON_PIN 6
#define CHILD_ID 2
#define RELAY_ON 1
#define RELAY_OFF 0
#include <SPI.h>
#include <avr/wdt.h>
#include <Wire.h>
#define RESETWATCHDOG
Bounce debouncer = Bounce();
bool state = false;
bool initialValueSent = false;

MyMessage msg(CHILD_ID, V_STATUS);

void setup()
{
Serial.begin(115200);
pinMode(BUTTON_PIN, INPUT_PULLUP);
debouncer.attach(BUTTON_PIN);
debouncer.interval(10);
digitalWrite(RELAY_PIN, RELAY_ON);
pinMode(RELAY_PIN, OUTPUT);
}

void presentation() {
sendSketchInfo("Grey Lamp", "1.0");
present(CHILD_ID, S_BINARY);
}

void loop()
{
wdt_reset();
if (!initialValueSent) {
Serial.println("Sending initial value");
send(msg.set(state ? RELAY_ON : RELAY_OFF));
Serial.println("Requesting initial value from controller");
request(CHILD_ID, V_STATUS);
wait(2000, C_SET, V_STATUS);
}

if (debouncer.update()) {
if (debouncer.read() == LOW) {
state = !state;
send(msg.set(state ? RELAY_ON : RELAY_OFF), true);
}
}

}

void receive(const MyMessage &message) {
if (message.isAck()) {
Serial.println("This is an ack from gateway");
}

if (message.type == V_STATUS) {
if (!initialValueSent) {
Serial.println("Receiving initial value from controller");
initialValueSent = true;
}
state = (bool)message.getInt();
digitalWrite(RELAY_PIN, !state ? RELAY_ON : RELAY_OFF);
send(msg.set(state ? RELAY_ON : RELAY_OFF));
}
}

@el-tigro
I have other nodes / devices and they all do the same.
HA config

mysensors:
gateways:
- device: '/dev/ttyUSB0'
persistence_file: '/config/myhouse/mysensors.json'
- device: mqtt
persistence_file: '/config/myhouse/mysensors4.json'
topic_in_prefix: 'mygateway1-out'
topic_out_prefix: 'mygateway1-in'
optimistic: false
persistence: true
retain: true
version: '2.0'

mqtt:
broker: 192.168.1.***
port: 1883
client_id: home-assistant-1
keepalive: 60

Gateway code

#define MY_DEBUG
#define MY_BAUD_RATE 115200
#define MY_RADIO_NRF24
#define MY_GATEWAY_MQTT_CLIENT
#define MY_GATEWAY_ESP8266
#define MY_MQTT_PUBLISH_TOPIC_PREFIX "mygateway1-out"
#define MY_MQTT_SUBSCRIBE_TOPIC_PREFIX "mygateway1-in"
#define MY_MQTT_CLIENT_ID "Gateway"
#define MY_ESP8266_SSID "BTHub6-36PM"
#define MY_ESP8266_PASSWORD "88888888"
#define MY_ESP8266_HOSTNAME "Gateway node"
#define MY_CONTROLLER_IP_ADDRESS 192, 168, 1,***
#define MY_IP_GATEWAY_ADDRESS 192,168,1,***
#define MY_IP_SUBNET_ADDRESS 255,255,255,0
#define MY_PORT 1883
#include <ESP8266WiFi.h>
#include <MySensors.h>

void setup() {
}

void presentation() {
// Present locally attached sensors here
}

void loop() {
// Send locally attech sensors data here
}

@monte
Node debug. Appears to register but then no response to initial value request.
0 MCO:BGN:INIT NODE,CP=RNNNA--,VER=2.1.1
3 TSM:INIT
4 TSF:WUR:MS=0
11 TSM:INIT:TSP OK
12 TSM:INIT:STATID=66
15 TSF:SID:OK,ID=66
16 TSM:FPAR
53 TSF:MSG:SEND,66-66-255-255,s=255,c=3,t=7,pt=0,l=0,sg=0,ft=0,st=OK:
192 TSF:MSG:READ,0-0-66,s=255,c=3,t=8,pt=1,l=1,sg=0:0
197 TSF:MSG:FPAR OK,ID=0,D=1
2060 TSM:FPAR:OK
2061 TSM:ID
2062 TSM:ID:OK
2064 TSM:UPL
2069 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=24,pt=1,l=1,sg=0,ft=0,st=OK:1
2082 TSF:MSG:READ,0-0-66,s=255,c=3,t=25,pt=1,l=1,sg=0:1
2086 TSF:MSG:PONG RECV,HP=1
2089 TSM:UPL:OK
2092 TSM:READY:ID=66,PAR=0,DIS=1
2096 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=15,pt=6,l=2,sg=0,ft=0,st=OK:0100
2103 TSF:MSG:READ,0-0-66,s=255,c=3,t=15,pt=6,l=2,sg=0:0100
2110 TSF:MSG:SEND,66-66-0-0,s=255,c=0,t=17,pt=0,l=5,sg=0,ft=0,st=OK:2.1.1
2118 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=6,pt=1,l=1,sg=0,ft=0,st=OK:0
4127 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=11,pt=0,l=9,sg=0,ft=0,st=OK:Grey Lamp
4135 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=12,pt=0,l=3,sg=0,ft=0,st=OK:1.0
4144 TSF:MSG:SEND,66-66-0-0,s=2,c=0,t=3,pt=0,l=0,sg=0,ft=0,st=OK:
4150 MCO:REG:REQ
4153 TSF:MSG:SEND,66-66-0-0,s=255,c=3,t=26,pt=1,l=1,sg=0,ft=0,st=OK:2
4176 TSF:MSG:READ,0-0-66,s=255,c=3,t=27,pt=1,l=1,sg=0:1
4182 MCO:PIM:NODE REG=1
4184 MCO:BGN:STP
4185 MCO:BGN:INIT OK,TSP=1
Sending initial value
4190 TSF:MSG:SEND,66-66-0-0,s=2,c=1,t=2,pt=2,l=2,sg=0,ft=0,st=OK:0
Requesting initial value from controller
4198 TSF:MSG:SEND,66-66-0-0,s=2,c=2,t=2,pt=0,l=0,sg=0,ft=0,st=OK:
Sending initial value
6207 TSF:MSG:SEND,66-66-0-0,s=2,c=1,t=2,pt=2,l=2,sg=0,ft=0,st=OK:0
Requesting initial value from controller

I'm going crazy, any help appreciated.

My setup.
Pi 3 controller on ethernet.
HASSOS recently installed.
MQTT.
NodeMCU 09 wifi gateway.
My sensors switch / lamp.

Nodes and gateway talking fine. Controller and gateway register with MQTT server on HA (mosquitto).

Nodes are registering with gateway but not getting 'initial value' back from HA and repeats request.

This happened after I updated HA. Any help appreciated.

sorted works a treat now. My bad, used a sketch I had tinkered with in the past. sketches melded now. Finished sketch below for them that might need. The sketch is for domestic light swith.

#define MY_NODE_ID 5
#define MY_DEBUG
#define MY_RADIO_NRF24
#include <SPI.h>
#include <MySensors.h>
#include <Bounce2.h>
#include <DHT.h>
#define DHT_DATA_PIN 7
#define CHILD_ID 3
#define BUTTON_PIN  3
#define SENSOR_TEMP_OFFSET 0
#define CHILD_ID_TEMP 1
Bounce debouncer = Bounce();
static const uint64_t UPDATE_INTERVAL = 5000;
static const uint8_t FORCE_UPDATE_N_READS = 2;
float lastTemp;
unsigned long interval = 5000;
unsigned long previousMillis = 0;
uint8_t nNoUpdatesTemp;
int oldValue = -1;
bool metric = true;
MyMessage msg(CHILD_ID, V_LIGHT);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;


void presentation()
{
  sendSketchInfo("kitchen Lights", "1.1");
  present(CHILD_ID, S_LIGHT);
  present(CHILD_ID_TEMP, S_TEMP);
  metric = getConfig().isMetric;
}

void setup()
{
  pinMode(BUTTON_PIN, INPUT);
  digitalWrite(BUTTON_PIN, HIGH);
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(5);
  dht.setup(DHT_DATA_PIN);
  if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
    Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
  }
}

void loop()
{
  debouncer.update();
  int value = debouncer.read();
  if (value != oldValue) {
    send(msg.set(value == HIGH ? 1 : 0));
    oldValue = value;
  }
  unsigned long currentMillis = millis();
  if ((unsigned long)(currentMillis - previousMillis) >= interval) {
    dht.readSensor(true);
    float temperature = dht.getTemperature();
    if (isnan(temperature)) {
      Serial.println("Failed reading temperature from DHT!");
    } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {
      lastTemp = temperature;
      if (!metric) {
        temperature = dht.toFahrenheit(temperature);
      }
      nNoUpdatesTemp = 0;
      temperature += SENSOR_TEMP_OFFSET;
      send(msgTemp.set(temperature, 1));
#ifdef MY_DEBUG
      Serial.print("T: ");
      Serial.println(temperature);
#endif
    } else {
      nNoUpdatesTemp++;
    }
    previousMillis = millis();
  }
}

Hi.
I have put a dht11 sensor on my arduino nano light switch. The hardware switch is incase no UI or ALEXA down. I don't need the humidity component so I removed it.

#define MY_DEBUG
#define MY_RADIO_NRF24
#define MY_REPEATER_FEATURE
#define MY_NODE_ID 5
#include <SPI.h>
#include <MySensors.h> 
#include <elapsedMillis.h> 
#include <Bounce2.h>
#include <DHT.h>
#define DHT_DATA_PIN 7
#define RELAY_PIN  5
#define BUTTON_PIN  3
#define CHILD_ID 1
#define RELAY_ON 1
#define RELAY_OFF 0
#define SENSOR_TEMP_OFFSET 0
static const uint64_t UPDATE_INTERVAL = 5000;
static const uint8_t FORCE_UPDATE_N_READS = 1;
Bounce debouncer = Bounce();
bool state = false;
bool initialValueSent = false;
#define CHILD_ID_TEMP 3
unsigned long interval=10000; // the time we need to wait
unsigned long previousMillis=0; // millis() returns an unsigned long.
float lastTemp;

uint8_t nNoUpdatesTemp;
bool metric = true;
MyMessage msg(CHILD_ID, V_STATUS);
MyMessage msgTemp(CHILD_ID_TEMP, V_TEMP);
DHT dht;


void presentation()  
{ 
  sendSketchInfo("kitchen switch", "1.1");
  
  present(CHILD_ID, S_BINARY);
 present(CHILD_ID_TEMP, S_TEMP);
  metric = getConfig().isMetric;
}

void setup()
{
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  debouncer.attach(BUTTON_PIN);
  debouncer.interval(10);
  digitalWrite(RELAY_PIN, RELAY_OFF);
  pinMode(RELAY_PIN, OUTPUT);
  
  dht.setup(DHT_DATA_PIN); // set data pin of DHT sensor
  if (UPDATE_INTERVAL <= dht.getMinimumSamplingPeriod()) {
    Serial.println("Warning: UPDATE_INTERVAL is smaller than supported by the sensor!");
  }
}

void loop()      
{  
 
if (!initialValueSent) {
    Serial.println("Sending initial value");
    send(msg.set(state?RELAY_ON:RELAY_OFF));
    Serial.println("Requesting initial value from controller");
    request(CHILD_ID, V_STATUS);
    wait(5000, C_SET, V_STATUS);
    presentation();
  }
  if (debouncer.update()) {
    if (debouncer.read()==LOW) {
      state = !state;
    send(msg.set(state?RELAY_ON:RELAY_OFF), true);   
    }
  }

 unsigned long currentMillis = millis();
 if ((unsigned long)(currentMillis - previousMillis) >= interval) {
  
  dht.readSensor(true);
  float temperature = dht.getTemperature();
  if (isnan(temperature)) {
    Serial.println("Failed reading temperature from DHT!");
  } else if (temperature != lastTemp || nNoUpdatesTemp == FORCE_UPDATE_N_READS) {

    lastTemp = temperature;
    if (!metric) {
      temperature = dht.toFahrenheit(temperature);
    }
    nNoUpdatesTemp = 0;
    temperature += SENSOR_TEMP_OFFSET;
    send(msgTemp.set(temperature, 1));

    #ifdef MY_DEBUG
    Serial.print("T: ");
    Serial.println(temperature);
    #endif
  } else {
    nNoUpdatesTemp++;
  }
 previousMillis = millis();
 }}
void receive(const MyMessage &message) {
  if (message.isAck()) {
     Serial.println("This is an ack from gateway");
  }
  if (message.type == V_STATUS) {
    if (!initialValueSent) {
      Serial.println("Receiving initial value from controller");
      initialValueSent = true;
    }
    state = (bool)message.getInt();
    digitalWrite(RELAY_PIN, state?RELAY_ON:RELAY_OFF);
    send(msg.set(state?RELAY_ON:RELAY_OFF));
  }
}

my problem is that the temp shows ok, the switch sends commands when tripped but is not on the Home Assistant UI or in entities. I need this switch to show up to set triggers.

Any help appreciated

Pi3 Home assistant + mosquitto
esp8266 wireless gateway
nano nodes Nrf2401 radios

1485777547: Sending PINGRESP to mysensors-1
1485777562: Received PINGREQ from mysensors-1
1485777562: Sending PINGRESP to mysensors-1
1485777563: Received PUBLISH from mysensors-1 (d0, q0, r0, m0, 'mygateway1-out/5/25/1/0/16', ... (1 bytes))
1485777563: Sending PUBLISH to home-assistant-1 (d0, q0, r0, m0, 'mygateway1-out/5/25/1/0/16', ... (1 bytes))
1485777565: Received PUBLISH from mysensors-1 (d0, q0, r0, m0, 'mygateway1-out/5/25/1/0/16', ... (1 bytes))
1485777565: Sending PUBLISH to home-assistant-1 (d0, q0, r0, m0, 'mygateway1-out/5/25/1/0/16', ... (1 bytes))

This is the mqtt log for one on / off cycle.

Here is the most basic sketch I could find and tweaked the code to run as a toggle on a domestic light switch.

#define MY_RADIO_NRF24
#include <MySensors.h>
#include <SPI.h>
#define MY_NODE_ID 25
#define OPEN 1
#define CLOSE 0
#define switchpin 3
int oldvalue = OPEN;
MyMessage msg(MY_NODE_ID, V_TRIPPED);
uint8_t value = OPEN;

void setup()
{
  pinMode (switchpin, INPUT_PULLUP);
}

void presentation()
{
  sendSketchInfo("TESTER", "");
  present(MY_NODE_ID, S_DOOR);
}

void loop()
{
  if (digitalRead(switchpin) == !oldvalue)
  {
    value = value == OPEN ? CLOSE : OPEN;
    send(msg.set(value));
    oldvalue = value;
  }
}

With this code alone,no yaml entry, the node is found by HA and shows accordingly as triggered if the switch is flicked. mqtt all good, gateway happy.

How the fook do I attach switch result to the intended node?
Do I need a yaml entry for the physical switch? I tried but failed.
Do I then need to set up a trigger?

switch:
  - platform: mqtt
    name: "TESTER"
    command_topic: "mygateway1-in/2/2/1/0/2"
    payload_on: "1"
    payload_off: "0"
    optimistic: false
    qos: 0
    retain: true

This just gives me a new (software) switch in my dash and controls the light but physical switch (node 2 child 2) doesn't work.

Hello mate and thanks for chirping in. I realised a while ago that this project was well above my current knowledge base but thats like a red rag to bull, stubborn old git that I am.

After I got my HA, mqtt, MySensors and the gateway talking, my first few nodes found and set themselves up pretty much. I didn't have to jump into message construction, pub/sub, complex yaml code and that's the bit I'm stuck on. Once I get it, I'm away, the penny just hasn't dropped yet.

I think I need a night in, just me and mqtt, a nice meal, a bottle of soco, a few cuddles and really get to know each other. I guess thats true cyber sex, i do have a wife and kids.... honest.

Any reccommended sites, tutorials will be appreciated.

Cheers