Using Node-RED

On your local Node-RED instance, build the following flow. Make sure the "inject" node injects a JSON string.

• how did you configure the two MQTT nodes?
  
  

  Answer 1:

  
  

• Make sure you see the data published by all groups.

• Looking at the output on the debug console, what is the issue:

  Answer 2:

  
  

• How can you solve that?

  Answer 3:

  
  

Using your phone

On your phone, look for an MQTT client application. On the iPhone, you can use application "MQTTool"

• subscribe to the common topic, verify you receive all notifications
• publish on the common topic, verify you can see each other's message

• what type of OS do you have on your phone, and what client did you end up using?

  Answer 4: