axl_bool myqtt_storage_sub_exists ( MyQttCtx ctx,
MyQttConn conn,
const char *  topic_filter 

Allows to check if the provided topic_filter is already subscribed for the provided connection.

ctxThe context where operation takes place.
connThe connection to check subscription.
topic_filterThe topic filter to check.
axl_true if the subscription oepration was completed, otherwise axl_false is reported.

References myqtt_storage_sub_exists_common().