• Introduction
  • Features
  • Hardware Specifications
  • Dimensions
  • Layout
  • Interfaces
  • Application
• Basic Usage
  • Management Software
    • Connection with a PC
    • Initial Setup and Certificates
    • Firmware Upgrade
  • Reset
• MQTT Usage
  • Preparation
    • File System
    • AT Commands
    • Connecting Devices
  • MQTT Settings
    • Topic and Message Buffer
    • Timeout
    • Connection Flags
    • Connection Payload
    • QoS
  • Connecting to Broker
  • SUBSCRIBE
  • PUBLISH
  • Reading Messages
  • Etc.
    • Reading the Client ID
    • Setting Short Response
• Advanced
  • ATC & MQTT Settings
  • Activating PHPoC Engine
  • Advanced AT Commands

Reading Messages

---

If there are messages published to the subscribed topics, those messages will be received and can be read. In the case of multiple received messages, you can only read the last received message.

Reading a Message: +MNG

• Command Format

AT+MNG="<Topic>"
AT+MNG=<An ID of Topic Buffer>

• An example

at+mng="test/test_topic"
+MNG:12,test message
OK

• An example: Using a topic buffer

at+mbt=0,"test/test_topic"
OK
at+mng=0
+MNG:12,test message
OK

Getting the Number of Unread Messages: +MQNU

• Command Format

AT+MQNU
AT+MQNU="<Topic>"
AT+MQNU=<An ID of a Topid Buffer>

If you omit the topic or topic buffer ID, it will check all subscribed topics.

• An example

at+mqnu="test/test_topic"
+MQNU:1
OK

• An example: Using a topic buffer

at+mbt=0,"test/test_topic"
OK
at+mqnu=0
+MQNU:1
OK

Getting the Size of a Received Message: +MQNR

• Command Format

AT+MQNR="<Topic>"
AT+MQNR=<An ID of a Topic Buffer>

• An example

at+mqnr="test/test_topic"
+MQNU:12
OK

• An example: Using a topic buffer

at+mbt=0,"test/test_topic"
OK
at+mqnr=0
+MQNU:12
OK

---