CLEAN_SESSION Not work

Question

I have problems when I connect to my mqtt broker, it looks like it doesn't do a CLEAN_SESSION.. according to server logs.. I see when I connect to test clients ( pc ) with CLEAN_SESSION then it clearly appears in the log. This creates a lot of problems e.g. the client id is not registered by mqtt broker.. etc.. 
 conntions from nrf7002 is not clean=1 and not completed normally 
 Here log from my 7002 
 connection.log:2025-02-23T05:52:07.044Z Connection tcpiop.1 CWLNA1117 I: Create mqtt connection: ConnectionID=599 ClientID="_85.166.49.173_dS9ZdNyj" Endpoint="mqtt-ssl-ldap" UserID="demo24" CommonName="" Durable=0. 
 connection.log:2025-02-23T05:52:07.247Z Connection tcpiop.1 CWLNA2202 W: A message consumer could not be created due to an authorization failure: ConnectionID=599 ClientID="_85.166.49.173_dS9ZdNyj" Protocol="mqtt4-tcp" Endpoint="mqtt-ssl-ldap" UserID="demo24". 
 this log from working test client ( pc mosquitto ) 
 
 -connection.log:2025-02-23T20:12:14.118Z Connection tcpiop.1 CWLNA1117 I: Create mqtt connection: ConnectionID=3199 ClientID="41675380" Endpoint="mqtt-ssl-ldap" UserID="rb3" CommonName="" Durable=0. -connection.log:2025-02-23T20:12:14.164Z Connection tcpiop.1 CWLNA1111 N: Closing TCP connection: ConnectionID=3199 MonitorID=3199 ClientID="41675380" Protocol=mqtt4-tcp Endpoint="mqtt-ssl-ldap" From=[85.166.49.173]:59917 UserID="rb3" Uptime=0 RC=0 Clean=1 Reason="The connection has completed normally." ReadBytes=818 ReadMsg=1 WriteBytes=2,141 WriteMsg=0 LostMsg=0 WarnMsg=0. 
 # MQTT CONFIG_MQTT_LIB=y CONFIG_MQTT_CLEAN_SESSION=y CONFIG_MQTT_LOG_LEVEL_DBG=y 
 
 Is this a known problem? Is there any way to get a receipt that it is sending with a clean session? Does anyone have any suggestions?

Håkon Alseth · Accepted Answer

Hi, 
 
 I have set the config in question, and connected to a local mosquitto server, which has verbose logging enabled. 
 What is logged in the mosquitto.log file is: 
 ...
New client connected from 192.168.32.209:43333 as nrf7002dk-4172493585 (p2, c1, k60)
... 
 And this is the exact fields logged here: 
 https://github.com/eclipse-mosquitto/mosquitto/blob/master/src/handle_connect.c#L235-L236 
 
 You can also go into debug mode and check that the field is indeed set on your side when calling mqtt_client_init(): 
 https://github.com/nrfconnect/sdk-zephyr/blob/v3.7.99-ncs2/subsys/net/lib/mqtt/mqtt.c#L180 
 
 Can you please share information on how your client side implementation is setup? 
 Dev-ercom said: i ask supprt: Could the policy error message have something to do with it not recognizing the client ID? Before I send the clan session. 
 Admin say: No. It has already determined the clientid before it starts to try and consume things 
 but you said that i can see in the NRF log i haven't done that. can i see MQTT logs there? or do i have to turn it on in the configrue is it default there? 
 Logs can be enabled by setting CONFIG_SERIAL=y and CONFIG_LOG=y and opening up the COM-port using your favorite terminal (putty, realterm, etc). 
 Which example are you using, and what ncs version are you using? 
 
 Kind regards, 
 Håkon

CLEAN_SESSION Not work

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