MQTT failing to connect rc-2

[Bourne ToRide]

This error must have been seen 100's of times but I have found no answer

00:47:27.122 MQT: Attempting connection...
00:47:27.139 MQT: Connect failed to 192.168.1.1:1883, rc -2. Retry in 120 sec

Currently running MQTT on my router running openWRT V21.02 (BT HomeHub5) 

There is no network problem because it talks to my devices (x2)

AP1 SSId (RSSI)
TALKTALK661724 (100%, -45 dBm) 11n
Hostname
BBQ32-4876
MAC Address
7C:DF:A1:86:93:0C
IP Address (wifi)
192.168.1.161
Gateway
192.168.1.1
Subnet Mask
255.255.255.0
DNS Server1
192.168.1.1
DNS Server2
0.0.0.0

 
HTTP API
Enabled

 
MQTT Host
192.168.1.1
MQTT Port
1883
MQTT TLS
Disabled
MQTT User
DVES_USER
MQTT Client
DVES_86930C
MQTT Topic
BBQ32
MQTT Group Topic 1
cmnd/tasmotas/
MQTT Full Topic
cmnd/BBQ32/
MQTT Fallback Topic
cmnd/DVES_86930C_fb/
MQTT No Retain
Disabled

MQTT worked several years ago when I had V8.5 but now I am running ESP-C3 thats not an option, I am working towards installing HA on a laptop but need to get MQTT working first

[Philip Knowles]

Are the Client and Topic different?

 

Regards

 

Phil K

 

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[Philip Knowles]

Sorry found the details further down.

Error code rc-2 is caused by a network error between the device and MQTT broker. It could be a password error, 2 clients with the same name or a timing error

 

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From: 'Bourne ToRide' via TasmotaUsers
Sent: 25 May 2022 15:22
To: TasmotaUsers
Subject: MQTT failing to connect rc-2

 

This error must have been seen 100's of times but I have found no answer

--

[Mark Abraham]

I have the same issue. I have two s26 plugs. One on 8.5.1 and the other on 12.0.2

I can't get either of them to connect to mosquitto and have been pulling my hair out trying to work out why. The first has rc 2 and the other has rc 5.

I,ve put the same password that is in the node red node so should work. Tasmota password field changes it to 4 characters when its saved which I thought odd. 

Did you find a solution?

Thanks, mark

[Philip Knowles]

Is it rc -5 or rc 5 there’s a difference (same for 2)

 

Code	Constant name	Description
-5	MQTT_DNS_DISCONNECTED	the DNS server cannot be reached or name cannot be resolved
-4	MQTT_CONNECTION_TIMEOUT	the server didn't respond within the keepalive time
-3	MQTT_CONNECTION_LOST	the network connection was broken
-2	MQTT_CONNECT_FAILED	the network connection failed
-1	MQTT_DISCONNECTED	the client is disconnected cleanly
0	MQTT_CONNECTED	the client is connected
1	MQTT_CONNECT_BAD_PROTOCOL	the server doesn't support the requested version of MQTT
2	MQTT_CONNECT_BAD_CLIENT_ID	the server rejected the client identifier
3	MQTT_CONNECT_UNAVAILABLE	the server was unable to accept the connection
4	MQTT_CONNECT_BAD_CREDENTIALS	the username/password were rejected
5	MQTT_CONNECT_UNAUTHORIZED	the client was not authorized to connect

 

 

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[Mark Abraham]

Ah sorry its rc -5 and rc -2.

[Mark Abraham]

Okay thanks. So I'm guessing rc -2 and rc-5 means that mosquitto isn't accepting outside connections from the same lan? 

[Bourne ToRide]

only fails when I put ip address in host field of MQTT , then rc -2.    

MQTT  installed on my OpenWRT router, tried all sorts to prevent outside connections from same LAN being dropped, even tried a firewall rule to send all port 1883 traffic to 192.168.1.1

[Philip Knowles]

Can you share a screenshot of the MQTT configuration page?

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[Bourne ToRide]

 17:03:25.804 MQT: Attempting connection...
17:03:25.820 MQT: Connect failed to 192.168.1.1:1883, rc -2. Retry in 120 sec

[Bourne ToRide]

Just changed ip address to   test.mosquitto.org  and that worked so it is a MQTT server problem

On Tuesday, 19 July 2022 at 22:08:43 UTC+1 knowles...@gmail.com wrote:

[Philip Knowles]

I meant the configuration page with the addresses and topics etc

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[billy jack newman]

Your ip address ending in 1.1 is generally your router ip, make sure you have correct ip address for the device that had mqtt server installed on

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[Philip Knowles]

OP said was installed on his openWRT modem

 

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[billy jack newman]

Oh, I missed that sorry 

[Marcos HIDO]

Hi, I have tha same scenario. Openwrt as router, Mosquitto broker inside router in IP ..1.  Hi have more than 40 tasmoted devices, and several giving me this same error.rc-2 with continous disconnections.  There are some news ?

[Marcos HIDO]

I can provide some more information.

If I connect some devecie to the broker in Hassio, (IP....121)  the devices atill  giving the same problem of disconnection rc -2

In log mosquitto Hassio, I receive this msgs as spam hundred times... " error: received null username, clientid or topic, or access is equal or less than 0 for acl check", devices connect to the server mqtt, but each 2 or 5 minutes they disconnect and again rc -2 and connection tries

[Philip Knowles]

Check the maximum number of devices – many routers limit to 32 – and rc-2 is a network connection issue

 

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[Marcos HIDO]

even openwrt have too much space an recurses, as i explained i tested with broker HA and only two devices tasmota, and same error..

[Philip Knowles]

Without more information (such as a screenshot of the MQTT configuration page, router wifi logs, tasmota console log, the total number of devices – not just Tasmota ones - and the chipset of the modem – the ath10k-ct driver limits to 32 devices) it is impossible to guess what is causing your network connection error

 

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[Bourne ToRide]

Finally fixed my MQTT on Openwrt issues

rc-2 network connection error is not always a network error, it could be that MQTT is not running for some reason. Its pretty obvious that the network is OK because you have a working Tasmota device.

Try setting logging to syslog in your MQTT config, then Status > System Log will give you lots of useful info :- like MQTT doesn't run with  "Use this LuCI configuration page" unticked if the path to your config file is not correct

rc-5 authentication error will happen if you create a plain text password file without using the provided, Putty need to run that.

[Philip Knowles]

Sorry, but a network connection error doesn’t mean that the network isn’t working but that device cannot connect to the broker over the network so the broker not running, etc would come into that category. The point is that it wasn’t a Tasmota issue but a network issue.

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