I want to send temperature (using existing sensor on nRF DK) data from server to client.

Question

Hello, 
 I want to use existing Generic light switch model to send temperature sensor data from server to client. 
 using Light switch example of nRF Mesh V2.2.0. 
 Functionality of Light Switch: 
 
 The Button 1 on the client board turns ON LED 1 on the servers with Odd addresses. 
 The Button 2 on the client board turns OFF LED 1 on the servers with Odd addresses. 
 The Button 3 on the client board turns ON LED 1 on the servers with Even addresses. 
 The Button 4 on the client board turns OFF LED 1 on the servers with Even addresses 
 
 Like wise without disturbing the existing functionality I want to send temperature data. 
 while pressing button 1 on client board It has to get temperature data from server and display it on RTT viewer. 
 while pressing button 3 also on client board It has to get temperature data from server and display it on RTT viewer. 
 along with that by pressing button 3 on server it has to send temperature data of the server to client. 
 please help me.

Bjørn Kvaale · Answer

Hi, 
 Have you already bought a temperature sensor or do you want to use the die temperature function on the dev kit itself? It seems like you want the die temperature. If you are using a temperature sensor, have you already hooked this part up to a dev kit & gotten temperature readings on the log? 
 If not, I would focus on this part first. 
 Next, do you really require mesh for this usecase? Are you planning on having multiple servers which each send temperature data to the client? If not, I would recommend taking a look at one of our easier ble central & peripheral examples instead. 
 Then, I would focus on sending the acknowledged status message back to the client from the server. First off, you will need to change the functionality to get this working. Pressing the buttons on the client publishes a set message to the odd or even group address, which the odd & even servers are subscribed to. Therefore, you will not get an acknowledged message from the server in return, saying in essence: "Hey, I got your message & processed it correctly". 
 You probably want to send an acknowledged unicast message to the server address & change the status message (see config_messages.h for tips & create your own status message reply) slightly so that you not only send a status code, but also a status value (i.e. temperature value). You will most likely want to create your own mode l to achieve this (or update the generic on off model). 
 Update : You could also send a get message from the client to the server & the server will then send a status message back to the client. However, if you want to set the LED on the server & get the temperature, it could be an idea to use a acknowledged set message instead. 
 Kind Regards, 
 Bjørn