Overview:

This app will be used to sniff all MQTT messages at a given broker. You should also be able to inject (publish) arbitrary messages.

Functionality

• Top level control to set MQTT broker. Indicator on whether we're connected or not.
• Need to list subscriptions. Capability to remove a subscription (like if you do "#"). Print messages in time.
• Entry boxes at the bottom: topic and message. Ability via scroll down to pick old topic