peek

View most recent message from MQTT topic

Since R2022a

Syntax

mqttMsg = peek(mqttClient)

mqttMsg = peek(mqttClient,Topic=mqttTopic)

Description

mqttMsg = peek(mqttClient) returns the most recent message from all subscribed topics for the specified MQTT client, as a timetable of messages. This function does not flush the messages, so you can examine the same messages multiple times.

mqttMsg = peek(mqttClient,Topic=mqttTopic) returns the most recent message from the specified topic.

Examples

View Latest MQTT Topic Message

View the most recent message of a subscribed MQTT topic.

mqttMsg = peek(mqttClient,Topic="TopMW01")

mqttMsg =

  1×2 timetable

            Time              Topic           Data      
    ____________________    _________    _______________

    14-Dec-2021 16:29:09    "TopMW01"    "Hello World 3"

Input Arguments

mqttClient — MQTT client

Client object

MQTT client specified as an icomm.mqtt.Client object, created with the mqttclient function.

Example: mqttClient = mqttclient()

Data Types: object

mqttTopic — MQTT topic

string | char

MQTT topic to view the message from, specified as a string or character vector.

Example: "trubits/mqTop48"

Data Types: string | char

Output Arguments

mqttMsg — Message viewed from MQTT topic

timetable

Message viewed from MQTT topic, returned as a timetable.

Version History

Introduced in R2022a