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:
Answer 1:
Make sure you see the data published by all participants.
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 2:
Answer 2:
publish a message with your name in it on the MQTT broker