User Manual

Parameters:

on: Whether or not the published message should be 'retained' by the MQTT broker. Sending a message with

the this set to 'false' (0) will clear any previously retained message from the broker.

Returns: Nothing

Subscribe Callbacks

You can also subscribe or unsubcribe to publications on the topic using the following functions:

bool subscribe (messageHandler_t mh)

This function will subscribe to the topic and any changes will be sent to the specified callback handler.

Parameters:

mh: The callback handler where the subscription event should be redirected to.

Returns: 'True' (1) is the subscribe was successful, otherwise 'false' (0).

Subscription callback handlers have the following format:

The default value for 'retain' is false, unless it is modified using this function.

bool subscribe (messageHandler_t mh);

bool unsubscribe (void);

bool subscribed (void);