EMQ – publish a message to singletopic

Publish a message to the system singlepubtopic. singlepubtopic is a predefined topic for single-subscription systems. The host does not need to register a publish topic with +EMQPUBOPEN.

The configuration file defines the publish topic and QoS. The topic index is not required. See Using the AnyNet SMARTconnect™ configuration file.

Type	Syntax	Returned result
Test	AT+EMQ=?	+EMQ: OK
Read	AT+EMQ?	OK or ERROR
Write	AT+EMQ=	OK, :SEND OK, +ETM ERROR:, or ERROR

For the Write command:

• Send an unquoted message as unmodified text.
• Limit the payload to 1000 printable characters.
• Send quoted ASCII-hex data with an even number of characters from 0-9, a-f, or A-F.
• Start quoted JSON data with { immediately after the opening quote. AnyNet SMARTconnect™ does not validate JSON.
• AnyNet SMARTconnect™ converts ASCII-hex to binary for transmission. It removes escape characters from JSON messages.

The module returns :SEND OK after it publishes the message. This may wait until AnyNet SMARTconnect™ reconnects. The module returns +ETM ERROR: for command-specific errors. Confirm that singlepubtopic is configured. The module returns ERROR when the command is invalid or a parameter is missing.

Example

Send the message:

AT+EMQ="{"BatteryPower": "Low"}"

The module returns:

OK
:SEND OK