how to read other device status with arduino?

[leeoz]

Hey,
I'm using veraEdge with arduino gateway and I have a few temperature sensors on my network.
Ive search the forums and examples but could find a way to do what I want.

Let say I have arduino1 has a DHT sensor and is a S_TEMP device #11 on my network
and arduino2 has LCD and is set to be S_HVAC device #12 on my network

I would like to show on arduino2 LCD the temperature read by arduino1.
Can u please help?

[BartE]

@leeoz there are two ways to achieve this

1. The easy way:
   Each time the temperature is changed in arduino1 and the controller is updated with a
   message like this:

gw.send(msgTemp.set(((float)temperature / 10.0), 1)); 

Also send a message to arduino2 something like this:
arduino1 code:

// This can be the sensor ID on arduino2 device #12 (but if you do not check each integer between 1-254 will do)
#define MYSENSOR_TEMP_LCD  1
MyMessage msgTempNode2 (MYSENSOR_TEMP_LCD,  V_TEMP);  

void loop ()
{
    gw.process();
    ... do stuff
   if (oldtemperature  != temperature)
   {     // inform the gateway we have a new temp.
        gw.send(msgTemp.set(((float)temperature / 10.0), 1)); 
    
        gw.wait(100); // give the gateway some time to process the 1ste message

       // inform our LCD slave node also about the temp. change
       msgTempNode2.setDestination(12); // This is the node ID on arduino2 
       gw.send(msgTempNode2.set(((float)temperature / 10.0), 1),; 
       oldtemperature  = temperature;
  }

    ... do some more stuff
}

The LCD arduino should handle the incoming TEMP message, arduino2 code:

void incomingMessage(const MyMessage &message) {
   if (message.isAck()) {
        Serial.println(F("GW ack"));
   }
   switch (message.type) {
      case V_TEMP:
          Serial.print("New temperature received : ");
          Serial.println(message.getFloat());
          ... do some stuff to update your LCD screen
          break; 
  }
}

2)The second more complex way is to request the temperature from arduino2 to arduino1
arduino1 code:

// This can be the sensor ID on arduino2 device #12 (but if you do not check each integer between 1-254 will do)
#define MYSENSOR_TEMP_LCD  1
MyMessage msgTempNode2 (MYSENSOR_TEMP_LCD,  V_TEMP);  

void loop ()
{
    gw.process();
    ... do stuff
   if (oldtemperature  != temperature)
   {     // inform the gateway we have a new temp.
        gw.send(msgTemp.set(((float)temperature / 10.0), 1)); 
        // Store the temp.
        oldtemperature  = temperature;
  }
   ... do more stuff
}

void incomingMessage(const MyMessage &message) {
    if (mGetCommand(message) == C_REQ) {
         MyMessage answerMsg;
         Serial.print("Incoming request for sensor: ");
         Serial.println(message.sensor);
         mSetCommand(answerMsg, C_SET);
         answerMsg.setSensor(message.sensor);
         answerMsg.setDestination(message.sender);
         switch (message.sensor) {
           case MYSENSOR_TEMP:
               answerMsg.setType(V_TEMP);
               gw.send(answerMsg.set((float)(oldtemperature/ 10.0), 1));
               break;
        }
    } else {
        if (message.isAck()) {
            Serial.println(F("GW ack"));
        }
        switch (message.type) {
            ... handle other messages
        }
   }
}

arduino2 code:

void loop ()
{
  gw.process();
    ... do stuff
   if (time_to_poll_for_temp())
   {     // Request for temperature
         gw.request(MYSENSOR_TEMP, V_TEMP, 12);   // This is the node ID on arduino2 
  }
}

void incomingMessage(const MyMessage &message) {
   if (message.isAck()) {
        Serial.println(F("GW ack"));
   }
   switch (message.type) {
      case V_TEMP:
          Serial.print("New temperature received : ");
          Serial.println(message.getFloat());
          ... do some stuff to update your LCD screen
          break; 
  }
}
``

[leeoz]

@BartE
Tnx for the respose, great.
Also, if i would like to request value from vera?
So i use the gw.request(VeraDeviceID, V_TEMP,??)

Also for solution 2, on the request from arduino2 code,
gw.request(MYSENSOR_TEMP, V_TEMP, 12);
MYSENSOR_TEMP is what?
And why did u type 12? The sensor id is 11...

I think that in general i dont understad the use of gw.request()

[BartE]

@leeoz said:

@BartE
Tnx for the respose, great.
Also, if i would like to request value from vera?
So i use the gw.request(VeraDeviceID, V_TEMP,??)

Requesting Vera is not possible, there is no request interface between the GW and Vera

Also for solution 2, on the request from arduino2 code,
gw.request(MYSENSOR_TEMP, V_TEMP, 12);
MYSENSOR_TEMP is what?
Just a sensor ID on your arduino1
And why did u type 12? The sensor id is 11...

True, this should have been 11

I think that in general i dont understad the use of gw.request()

gw,request() sends a message to a different node requesting for data, the requested node has to process this message and respond with a second message. Look at this link at the "Requesting data" paragraph

[leeoz]

@BartE
Ok, I think I got it all. Great tnx a lot