OpenHAB/MQTT Tips & Hints

[siod]

@Yveaux
could you please post your arduino code of controlling your RGB (I guess it´s a RGB LED Strip!?)?

Thanks for your help!!

[siod]

I build up a mqtt gateway and configured it in openhab.cfg. Now I would like to set up a mosquitto server on a raspberry pi, too. Is it possible to add this new MQTT server to the openhab.cfg beside the already set up MQTT gateway?

[tomkxy]

Why not setup the Mosquitto broker connect OpenHab to it and use the MQTTClientGateway which connects as a client to the Mosquitto broker. Has been discussed at several places in the forum already. You can find the MQTTClientGateway in the development branch.

[John Connolly]

This post is deleted!

[siod]

@tomkxy
I´m reading in the forums for weeks now, but I don´t get it to work. I´ve succesfully set up Mosquitto on my raspi, also openHAB is running there. MQTTEthernetGateway (from Startpage) is pingable. One sensor is running and working.

I don´t know how to get the MQTTEthernetGateway communicate with the Mosquitto Broker. I´ve read about "bridging" what made me more confused as I already was.

So, right now, when I subscribe to MyMQTT/# using "mosquitto_sub -t MyMQTT/#" on my Raspi I don´t see any communication coming in.

What do I have to do to get the MQTTEthernetGateway (=MQTTClientGateway I suppose!?!) connecting to Mosquitto?

Or: must I setup the MQTTEthernetGateway like this: http://forum.mysensors.org/topic/524/mqtt-client-gateway instead of using the sketch from http://www.mysensors.org/build/mqtt_gateway?

Thanks for your help!!

[tomkxy]

@siod I am not sure to what code you are exactly referring to if you say MQTTEthernetGateway.
In the mysensor Github he cleaned up the code I merged from my Github. I did not test that code so far.
So I can only comment on the MQTTClientGateway you can find in my Github https://github.com/tomkxy/Arduino.git in branch MQTTClientGateway.

I suggest you start off ignoring Openhab at the moment. Just test with clients using mosquitto_sub and mosquito_pub commands from mosquito.

In the MQTTClientGateway sketch you need to adapt the IP related infos. See excerpt from my config.

//replace with ip of server you want to connect to, comment out if using 'remote_host'
uint8_t remote_ip[] =  { 192, 168, 178, 74 };  // Mosquitto broker

//replace with hostname of server you want to connect to, comment out if using 'remote_ip'
//char* remote_ip = "server.local";
//replace with the port that your server is listening on
#define remote_port 1883
//replace with arduinos ip-address. Comment out if Ethernet-startup should use dhcp. Is ignored on Yun
uint8_t local_ip[] = {192, 168, 178, 11};
//replace with ethernet shield mac. It's mandatory every device is assigned a unique mac. Is ignored on Yun
uint8_t mac[] = { 0xA2, 0xAE, 0xAD, 0xA0, 0xA0, 0xA2 };

Depending on whether you use the signing feature or not you have to comment the define MY_SIGNING_FEATURE in my_config.h.

If your sketch is running you should see one additional client connected on your mosquito broker.
You can subscribe with mosquito_sub to $SYS/# which gives you all sorts of statistics.

In order to check whether your Arduino connected to the broker you can also put a debug statement in the loop function. Just check and print the return code from the client.connect() call.

If the connect did not work double check that you configured the correct IP address and port, and make also sure that you fulfill the authentication requirements configured in the broker.

If the connection works publish a message to the broker for a topic like MyMQTT/27/5/V_PRESSURE
The MQTTClientGateway sketch should receive that and you should see that in the log.

Next reset your sensor node. You should see a message being processed by MQTTClientGateway and then being published to the MQTT broker.

Only after all that works you start dealing with OpenHab.

Hope that helps.

[siod]

Hi tomkxy,

thanks for your detailed answer, I will test all your suggestions after I got my GW work on LAN, right now it´s not answering to pings and I don´t get it why....

I´ve uploaded the ntruchsees sketch from http://forum.mysensors.org/topic/524/mqtt-client-gateway now and configured IP address, port and MAC.
When I was talking about MQTTEthernetGateway I was talking about the MySensors Sketch at http://forum.mysensors.org/topic/524/mqtt-client-gateway.

I will get back to you and give your more info as soon as the Gateway in it´s actual state works in my network!

[tomkxy]

@siod I adapted the ntruchsees for the MySensors library version 1.5 which you find here
https://github.com/tomkxy/Arduino.git

[siod]

@tomkxy

I could compile your code now, unfortunately I still cannot ping the gw.

BTW: In ntruchsess`code I had to enter the Mosquitto broker IP, why isn´t this part in your code?

//replace with ip of server you want to connect to, comment out if using 'remote_host'
uint8_t remote_ip[] = { 192, 168, 1, 50 };

[tomkxy]

It is the same in my code. See the code extract in the previous reply above. The variable is remote_ip[].

[siod]

sorry, but I can´t fin it in your code:

/**
 * 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 - Created by Daniel Wiegert <daniel.wiegert@gmail.com>
 * 
 * DESCRIPTION
 * MyMQTT Broker Gateway 0.1b
 * Latest instructions found here:
 * http://www.mysensors.org/build/mqtt_gateway
 * http://www.mysensors.org/build/ethernet_gateway
 * 
 * Change below; TCP_IP, TCP_PORT, TCP_MAC
 * This will listen on your selected TCP_IP:TCP_PORT below, Please change TCP_MAC your liking also.
 * 1 -> NOTE: Keep first byte at x2, x6, xA or xE (replace x with any hex value) for using Local Ranges.
 * 2 You can use standard pin set-up as MySensors recommends or if you own a IBOARD you may change
 *	the radio-pins below if you hardware mod your iBoard. see [URL BELOW] for more details.
 *	http://forum.mysensors.org/topic/224/iboard-cheap-single-board-ethernet-arduino-with-radio/5
 *
 * Don't forget to look at the definitions in MyMQTT.h!
 *
 *	define TCPDUMP and connect serial interface if you have problems, please write on
 *	http://forum.mysensors.org/ and explain your problem, include serial output. Don't forget to
 *	turn on DEBUG in libraries\MySensors\MyConfig.h also.
 *
 *	MQTT_FIRST_SENSORID is for 'DHCP' server in MyMQTT. You may limit the ID's with FIRST and LAST definition.
 *	If you want your manually configured below 20 set MQTT_FIRST_SENSORID to 20.
 *	To disable: set MQTT_FIRST_SENSORID to 255.
 *
 *	MQTT_BROKER_PREFIX is the leading prefix for your nodes. This can be only one char if like.
 *
 *	MQTT_SEND_SUBSCRIPTION is if you want the MyMQTT to send a empty payload message to your nodes.
 *	This can be useful if you want to send latest state back to the MQTT client. Just check if incoming
 *	message has any length or not.
 *	Example: if (msg.type==V_LIGHT && strlen(msg.getString())>0) otherwise the code might do strange things.
 *
 * (*) Address-layout is : [MQTT_BROKER_PREFIX]/[NodeID]/[SensorID]/V_[SensorType]
 *	NodeID and SensorID is uint8 (0-255) number.
 *	Last segment is translation of the sensor type, look inside MyMQTT.cpp for the definitions.
 *	User can change this to their needs. We have also left some space for custom types.
 *
 * Special: (sensor 255 reserved for special commands)
 * You can receive a node sketch name with MyMQTT/20/255/V_Sketch_name (or version with _version)
 *
 * To-do:
 * Special commands : clear or set EEPROM Values, Send REBOOT and Receive reboot for MyMQTT itself.
 * Be able to send ACK so client returns the data being sent.
 * ... Please come with ideas!
 * What to do with publish messages.
 *
 * Test in more MQTT clients, So far tested in openhab and MyMQTT for Android (Not my creation)
 * - http://www.openhab.org/
 * - https://play.google.com/store/apps/details?id=at.tripwire.mqtt.client&hl=en
 * ... Please notify me if you use this broker with other software.
 * 
 *  How to set-up Openhab and MQTTGateway:
 * http://forum.mysensors.org/topic/303/mqtt-broker-gateway
 */

#include <DigitalIO.h>
#include <SPI.h>

#include <MySigningNone.h>
#include <MyTransportRFM69.h>
#include <MyTransportNRF24.h>
#include <MyHwATMega328.h>
#include <MySigningAtsha204Soft.h>
#include <MySigningAtsha204.h>

#include <MySensor.h>
#include <MsTimer2.h>
#include <Ethernet.h>
#include "MyMQTT.h"


#define INCLUSION_MODE_TIME 1 // Number of minutes inclusion mode is enabled
#define INCLUSION_MODE_PIN  3 // Digital pin used for inclusion mode button

// * Use this for IBOARD modded to use standard MISO/MOSI/SCK, see note *1 above!
/*
#define RADIO_CE_PIN        3			// radio chip enable
#define RADIO_SPI_SS_PIN    8			// radio SPI serial select
#define RADIO_ERROR_LED_PIN A2  		// Error led pin
#define RADIO_RX_LED_PIN    A1  		// Receive led pin
#define RADIO_TX_LED_PIN    A0  		// the PCB, on board LED
*/

// * Use this for default configured pro mini / nano etc :
///*

#define RADIO_CE_PIN        5		// radio chip enable
#define RADIO_SPI_SS_PIN    6		// radio SPI serial select
#define RADIO_ERROR_LED_PIN 7		// Error led pin
#define RADIO_RX_LED_PIN    8		// Receive led pin
#define RADIO_TX_LED_PIN    9		// the PCB, on board LED*/

#define TCP_PORT 1883						// Set your MQTT Broker Listening port.
IPAddress TCP_IP ( 192, 168, 1, 51 );				// Configure your static ip-address here
byte TCP_MAC[] = { 0x02, 0xDE, 0xAD, 0x00, 0x00, 0x42 };	// Mac-address - You should change this! see note *2 above!

//////////////////////////////////////////////////////////////////

// NRFRF24L01 radio driver (set low transmit power by default) 
MyTransportNRF24 transport(RADIO_CE_PIN, RADIO_SPI_SS_PIN, RF24_PA_LEVEL_GW);  
//MyTransportRFM69 transport;

// Message signing driver (signer needed if MY_SIGNING_FEATURE is turned on in MyConfig.h)
//MySigningNone signer;
//MySigningAtsha204Soft signer;
//MySigningAtsha204 signer;

// Hardware profile 
MyHwATMega328 hw;

// Construct MySensors library (signer needed if MY_SIGNING_FEATURE is turned on in MyConfig.h)
MySensor gw(transport, hw /*, signer*/);


EthernetServer server = EthernetServer(TCP_PORT);
EthernetClient *currentClient = NULL;
MyMessage msg;
char convBuf[MAX_PAYLOAD*2+1];
char broker[] PROGMEM = MQTT_BROKER_PREFIX;
bool MQTTClientConnected = false;
uint8_t buffsize;
char buffer[MQTT_MAX_PACKET_SIZE];
volatile uint8_t countRx;
volatile uint8_t countTx;
volatile uint8_t countErr;


void writeEthernet(const char *writeBuffer, uint8_t *writeSize) {
#ifdef TCPDUMP
	Serial.print(">>");
	char buf[4];
	for (uint8_t a=0; a<*writeSize; a++) { sprintf(buf,"%02X ",(uint8_t)writeBuffer[a]);  Serial.print(buf); } Serial.println("");
#endif
	server.write((const uint8_t *)writeBuffer, *writeSize);
}


void processEthernetMessages() {
  char inputString[MQTT_MAX_PACKET_SIZE] = "";
  byte inputSize = 0;
  byte readCnt = 0;
  byte length = 0;

  EthernetClient client = server.available();
  if (client) {
    while (client.available()) {
      // Save the current client we are talking with
      currentClient = &client;
      byte inByte = client.read();
      readCnt++;

      if (inputSize < MQTT_MAX_PACKET_SIZE) {
        inputString[inputSize] = (char)inByte;
        inputSize++;
      }

      if (readCnt == 2) {
        length = (inByte & 127) * 1;
      }
      if (readCnt == (length+2)) {
        break;
      }
    }
#ifdef TCPDUMP
    Serial.print("<<");
    char buf[4];
    for (byte a=0; a<inputSize; a++) { sprintf(buf, "%02X ", (byte)inputString[a]); Serial.print(buf); } Serial.println();
#endif
    processMQTTMessage(inputString, inputSize);
    currentClient = NULL;
  }
}




void incomingMessage(const MyMessage &message) {
   rxBlink(1);
   sendMQTT(message);
} 



void setup()  
{ 
  Ethernet.begin(TCP_MAC, TCP_IP);

  
  countRx = 0;
  countTx = 0;
  countErr = 0;

  // Setup led pins
  pinMode(RADIO_RX_LED_PIN, OUTPUT);
  pinMode(RADIO_TX_LED_PIN, OUTPUT);
  pinMode(RADIO_ERROR_LED_PIN, OUTPUT);
  digitalWrite(RADIO_RX_LED_PIN, LOW);
  digitalWrite(RADIO_TX_LED_PIN, LOW);
  digitalWrite(RADIO_ERROR_LED_PIN, LOW);

 
  // Set initial state of leds
  digitalWrite(RADIO_RX_LED_PIN, HIGH);
  digitalWrite(RADIO_TX_LED_PIN, HIGH);
  digitalWrite(RADIO_ERROR_LED_PIN, HIGH);


  // Add led timer interrupt
  MsTimer2::set(300, ledTimersInterrupt);
  MsTimer2::start();


  // give the Ethernet interface a second to initialize
  delay(1000);


  // Initialize gateway at maximum PA level, channel 70 and callback for write operations 
  gw.begin(incomingMessage, 0, true, 0);  

  // start listening for clients
  server.begin();
  
  Serial.println("Ok!");
  Serial.println(TCP_IP);
}

void loop()
{
  gw.process();  
  
  processEthernetMessages();
}





inline MyMessage& build (MyMessage &msg, uint8_t destination, uint8_t sensor, uint8_t command, uint8_t type, bool enableAck) {
	msg.destination = destination;
	msg.sender = GATEWAY_ADDRESS;
	msg.sensor = sensor;
	msg.type = type;
	mSetCommand(msg,command);
	mSetRequestAck(msg,enableAck);
	mSetAck(msg,false);
	return msg;
}

char *getType(char *b, const char **index) {
	char *q = b;
	char *p = (char *)pgm_read_word(index);
	while (*q++ = pgm_read_byte(p++));
	*q=0;
	return b;
}

void processMQTTMessage(char *inputString, uint8_t inputPos) {
	char *str, *p;
	uint8_t i = 0;
	buffer[0]= 0;
	buffsize = 0;
	(void)inputPos;

	if ((uint8_t)inputString[0] >> 4 == MQTTCONNECT) {
		buffer[buffsize++] = MQTTCONNACK << 4;
		buffer[buffsize++] = 0x02;			// Remaining length
		buffer[buffsize++] = 0x00;			// Connection accepted
		buffer[buffsize++] = 0x00;			// Reserved
		MQTTClientConnected=true;			// We have connection!
	}
	if ((uint8_t)inputString[0] >> 4 == MQTTPINGREQ) {
		buffer[buffsize++] = MQTTPINGRESP << 4;
		buffer[buffsize++] = 0x00;
	}
	if ((uint8_t)inputString[0] >> 4 == MQTTSUBSCRIBE) {
		buffer[buffsize++] = MQTTSUBACK << 4;		// Just ack everything, we actually dont really care!
		buffer[buffsize++] = 0x03;			// Remaining length
		buffer[buffsize++] = (uint8_t)inputString[2];	// Message ID MSB
		buffer[buffsize++] = (uint8_t)inputString[3];	// Message ID LSB
		buffer[buffsize++] = MQTTQOS0;			// QOS level
	}
	if ((uint8_t)inputString[0] >> 4 == MQTTUNSUBSCRIBE) {
		buffer[buffsize++] = MQTTUNSUBACK << 4;
		buffer[buffsize++] = 0x02;			// Remaining length
		buffer[buffsize++] = (uint8_t)inputString[2];	// Message ID MSB
		buffer[buffsize++] = (uint8_t)inputString[3];	// Message ID LSB
	}
	if ((uint8_t)inputString[0] >> 4 == MQTTDISCONNECT) {
		MQTTClientConnected=false;			// We lost connection!
	}
	if (buffsize > 0) {
		writeEthernet(buffer,&buffsize);
	}

	// We publish everything we get, we dont care if its subscribed or not!
	if ((uint8_t)inputString[0] >> 4 == MQTTPUBLISH || (MQTT_SEND_SUBSCRIPTION && (uint8_t)inputString[0] >> 4 == MQTTSUBSCRIBE)) {
		buffer[0]= 0;
		buffsize = 0;
		// Cut out address and payload depending on message type.
		if ((uint8_t)inputString[0] >> 4 == MQTTSUBSCRIBE) {
			strncat(buffer,inputString+6,inputString[5]);
		} else {
			strncat(buffer,inputString+4,inputString[3]);
		}

#ifdef DEBUG
		Serial.println(buffer);
#endif
		// TODO: Check if we should send ack or not.
		for (str = strtok_r(buffer,"/",&p) ; str && i<4 ; str = strtok_r(NULL,"/",&p)) {
			if (i == 0) {
				if (strcmp_P(str,broker)!=0) {	//look for MQTT_BROKER_PREFIX
					return;			//Message not for us or malformatted!
				}
			} else if (i==1) {
				msg.destination = atoi(str);	//NodeID
			} else if (i==2) {
				msg.sensor = atoi(str);		//SensorID
			} else if (i==3) {
				unsigned char match=255;			//SensorType
#ifdef MQTT_TRANSLATE_TYPES				

				for (uint8_t j=0; strcpy_P(convBuf, (char*)pgm_read_word(&(vType[j]))) ; j++) {
					if (strcmp((char*)&str[2],convBuf)==0) { //Strip V_ and compare
						match=j;
						break;
					}
					if (j >= V_TOTAL)  break;
				}

#endif
                                if ( atoi(str)!=0 || (str[0]=='0' && str[1] =='\0') ) {
					match=atoi(str);
				}

				if (match==255) {
					match=V_UNKNOWN;
 				}
				msg.type = match;
			}
			i++;
		}						//Check if packge has payload
		if ((uint8_t)inputString[1] > (uint8_t)(inputString[3]+2) && !((uint8_t)inputString[0] >> 4 == MQTTSUBSCRIBE)) {
			strcpy(convBuf,inputString+(inputString[3]+4));
			msg.set(convBuf);			//Payload
		} else {
			msg.set("");				//No payload
		}
		txBlink(1);
		if (!gw.sendRoute(build(msg, msg.destination, msg.sensor, C_SET, msg.type, 0))) errBlink(1);

	}
}

void sendMQTT(const MyMessage &inMsg) {
        MyMessage msg = inMsg;
	buffsize = 0;
	if (!MQTTClientConnected) return;			//We have no connections - return
	if (msg.isAck()) {
//		if (msg.sender==255 && mGetCommand(msg)==C_INTERNAL && msg.type==I_ID_REQUEST) {
// TODO: sending ACK request on id_response fucks node up. doesn't work.
// The idea was to confirm id and save to EEPROM_LATEST_NODE_ADDRESS.
//  }
	} else {
		// we have to check every message if its a newly assigned id or not.
		// Ack on I_ID_RESPONSE does not work, and checking on C_PRESENTATION isn't reliable.
		uint8_t newNodeID = gw.loadState(EEPROM_LATEST_NODE_ADDRESS)+1;
		if (newNodeID <= MQTT_FIRST_SENSORID) newNodeID = MQTT_FIRST_SENSORID;
		if (msg.sender==newNodeID) {
			gw.saveState(EEPROM_LATEST_NODE_ADDRESS,newNodeID);
		}
		if (mGetCommand(msg)==C_INTERNAL) {
			if (msg.type==I_CONFIG) {
				txBlink(1);
				if (!gw.sendRoute(build(msg, msg.sender, 255, C_INTERNAL, I_CONFIG, 0).set(MQTT_UNIT))) errBlink(1);
				return;
			} else if (msg.type==I_ID_REQUEST && msg.sender==255) {
				uint8_t newNodeID = gw.loadState(EEPROM_LATEST_NODE_ADDRESS)+1;
				if (newNodeID <= MQTT_FIRST_SENSORID) newNodeID = MQTT_FIRST_SENSORID;
				if (newNodeID >= MQTT_LAST_SENSORID) return; // Sorry no more id's left :(
				txBlink(1);
				if (!gw.sendRoute(build(msg, msg.sender, 255, C_INTERNAL, I_ID_RESPONSE, 0).set(newNodeID))) errBlink(1);
				return;
			}
		}
		if (mGetCommand(msg)!=C_PRESENTATION) {
			if (mGetCommand(msg)==C_INTERNAL) msg.type=msg.type+(S_FIRSTCUSTOM-10);	//Special message
			buffer[buffsize++] = MQTTPUBLISH << 4;	// 0:
			buffer[buffsize++] = 0x09;		// 1: Remaining length with no payload, we'll set this later to correct value, buffsize -2
			buffer[buffsize++] = 0x00;		// 2: Length MSB (Remaing length can never exceed ff,so MSB must be 0!)
			buffer[buffsize++] = 0x08;		// 3: Length LSB (ADDR), We'll set this later
			strcpy_P(buffer+4, broker);
			buffsize+=strlen_P(broker);
#ifdef MQTT_TRANSLATE_TYPES
			if (msg.type > V_TOTAL) msg.type=V_UNKNOWN;// If type > defined types set to unknown.
 			buffsize+=sprintf(&buffer[buffsize],"/%i/%i/V_%s",msg.sender,msg.sensor,getType(convBuf, &vType[msg.type]));
#else
			buffsize+=sprintf(&buffer[buffsize],"/%i/%i/%i",msg.sender,msg.sensor,msg.type);
#endif
			buffer[3]=buffsize-4;			// Set correct address length on byte 4.
#ifdef DEBUG
			Serial.println((char*)&buffer[4]);
#endif
			msg.getString(convBuf);
			for (uint8_t a=0; a<strlen(convBuf); a++) {// Payload
				buffer[buffsize++] = convBuf[a];
			}
			buffer[1]=buffsize-2;			// Set correct Remaining length on byte 2.
			writeEthernet(buffer,&buffsize);
		}
	}
}


void ledTimersInterrupt() {
  if(countRx && countRx != 255) {
    // switch led on
    digitalWrite(RADIO_RX_LED_PIN, LOW);
  } else if(!countRx) {
     // switching off
     digitalWrite(RADIO_RX_LED_PIN, HIGH);
   }
   if(countRx != 255) { countRx--; }

  if(countTx && countTx != 255) {
    // switch led on
    digitalWrite(RADIO_TX_LED_PIN, LOW);
  } else if(!countTx) {
     // switching off
     digitalWrite(RADIO_TX_LED_PIN, HIGH);
   }
   if(countTx != 255) { countTx--; }

  if(countErr && countErr != 255) {
    // switch led on
    digitalWrite(RADIO_ERROR_LED_PIN, LOW);
  } else if(!countErr) {
     // switching off
     digitalWrite(RADIO_ERROR_LED_PIN, HIGH);
   }
   if(countErr != 255) { countErr--; }

}

void rxBlink(uint8_t cnt) {
  if(countRx == 255) { countRx = cnt; }
}
void txBlink(uint8_t cnt) {
  if(countTx == 255) { countTx = cnt; }
}
void errBlink(uint8_t cnt) {
  if(countErr == 255) { countErr = cnt; }
}

Also I must mention I am using a ENC28J60 chip on my Ethernet module. Could that be the problem of not answering to pings?

edit: Ah, sure, got the network problem:

//#include <Ethernet.h>
#include <UIPEthernet.h>

But still, remote_ip is not in the code I copied from your github library. Maybe you can post the correct code here!?

edit:
Ok, finally got it. I must admit I am not good in using Github, it´s very new to me...
Question: Do I always have to download the complete branch and overwrite my arduino file with it or ist it enough to only download your MQTTClientGateway example? Just for me to understand this...

Of course, when using the UIPEthernet library, the sketch is too big now...Is there a workaround?

[tomkxy]

@siod Sorry, i don't know whether that makes sense here. I do not know where this code came from.
I pointed you to the the contribution I made which is here: https://github.com/tomkxy/Arduino.git
in the MQTTClient branch (follow the link, select the branch mqttclient and click through the directories: libraries/MySensors/examples/MQTTClientGateway/ ).

As I wrote before the current development branch of the official MySensors library contains a cleaned up and re-factored version I didn't test and can say nothing about.

[siod]

I found a W5100 Ethernet Module et voila, everything works fine now!!! Thanks for your help @tomkxy !!

[tomkxy]

@siod If it works now you probably can give it a try with the latest version in the development branch of the Mysensor library.

[ericsko]

@Yveaux said:

And another small one; an RGB dimmer!

I tried this 3-dimmer approach, but I found it not responsive enough. Sometimes the arduino can't be fast enough to process 3 consecutive requests, and the result is lame. (it changes 2 of 3 colors only)
I think this would be more efficient with transmitting just one cummulative message with all 3 colors and decoding it in arduino.

[Yveaux]

@ericsko sounds to me that you're missing a message instead of the Arduino being too 'slow'.
But go ahead, use a single message to send the rgb value and post your findings in here!