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Table Of Contents
SARA-R4 series-AT commands manual
UBX-17003787 - R16
25MQTT
Page 301 of 401
25.2.4Notes
• The information text response to the read command does not display the password.
• Some network operators do not allow secure MQTT. In this case the AT+UMQTTC=1 command (MQTT
login) will return a failure response by means of the +UUMQTTC URC after an TLS timeout of 30 s.
SARA-R410M / SARA-R412M / SARA-N4
• For individual MQTT parameter fields, especially the string fields (double-quote delimited), the
continuation symbol + indicates whether the current display is a continuation from a previous display or
whether the current display has more information to be displayed.
• If the continuation symbol precedes the first double-quote, e.g., Topic: +"is continuing from previous
display", then this MQTT parameter field continues from a previous display command. If the continuation
symbol trails the last double-quote, e.g., Topic: "This message won't fit within the limita"+, then it
indicates that more information from this MQTT parameter remains to be displayed. If the continuation
symbol appears on both sides of the double-quotes, then this message is the continuation of a previous
display (and requires future displays to complete), e.g., Topic: +"is in the middle of a long messa"+.
• When displaying all of the MQTT client profile parameters, (AT+UMQTT?), only the non-default string
parameters are displayed. Thus, if will message, will topic, server name, IP address, username, or
password are not entered, they will not be displayed.
• Only IPv4 is supported.
• Client subscriptions and delivered messages across disconnects by either the server or the client <clean_
session>=0 is not supported.
• <op_code>=2 (MQTT server name) and <op_code>=3 (MQTT IP address) are equivalent, when broker
connection is established the server name is transformed into the IP address.
• After logout (AT+UMQTTC=0), MQTT settings need to be re-set individually or restored from the NVM
with the AT+UMQTTNV=1 command to login again.
• If <op_code>=11 (MQTT secure) and <MQTT_secure>=1 (MQTT TLS encryption enabled), the
<USECMNG_profile> parameter is mandatory.
SARA-R410M-63B / SARA-R410M-73B / SARA-R410M-83B
• The +UUMQTT URC is not supported.
SARA-R410M-02B / SARA-R410M-52B / SARA-R412M / SARA-N4
• The profile parameters MQTT will QoS value (<op_code>=6), MQTT will retain (<op_code>=7), MQTT
will topic (<op_code>=8), MQTT will message (<op_code>=9) and MQTT terse/verbose mode (<op_
code>=14) are provided in the read response for informational purposes. They cannot be set using the
+UMQTT set command:
o The MQTT will QoS value (<op_code>=6), MQTT will retain (<op_code>=7) and MQTT will topic
(<op_code>=8) are set with the +UMQTTWTOPIC AT command.
o The MQTT will message (<op_code>=9) is set with the +UMQTTWMSG AT command.
o The MQTT terse/verbose mode (<op_code>=14) is set with the +UMQTTC AT command.
SARA-R410M-02B
• The secure MQTT (TLS) (<op_code>=11) is not supported by SARA-R410M-02B-00.
25.3MQTT will topic configuration +UMQTTWTOPIC
+UMQTTWTOPIC
SARA-R410M-02B SARA-R410M-52B SARA-R410M-63B SARA-R410M-73B SARA-R410M-83B
SARA-R412M
Modules
SARA-N4
Syntax PIN required Settings saved Can be aborted Response time Error referenceAttributes
partial No No No - +CME Error
25.3.1Description
Configures the MQTT profile parameters related to the MQTT's will message ("Last Will and Testament"). In
the MQTT protocol, an MQTT client can configure a will message to be broadcast from the MQTT message
broker (MQTT server) whenever the server disconnects the MQTT client outside of a specific MQTT client
disconnect request. Upon disconnect, the MQTT server will publish the will message for a given connection
to the specified will topic name, with the specified Will QoS (Quality of Service). The will retain flag indicates