topic Re: Problem in MQTT in i.MX RT Crossover MCUs

Problem in MQTT

prasanthapplied — Mon, 09 Sep 2019 09:29:52 GMT

Dear all,

I'm using IMXRT1064 development board and i want to use lwip mqtt example. So i tried an example which was given in SDK. While running the board getting DHCP IP and it resolves MQTT broker ip then subscribed a topic. But after that the connection gets failed. The serial window comes like

Initializing PHY...

************************************************
MQTT client example
************************************************
Getting IP address from DHCP...

IPv4 Address : 10.10.37.1
IPv4 Subnet mask : 255.255.0.0
IPv4 Gateway : 10.10.0.202

Resolving "test.mosquitto.org"...
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Going to publish to the topic "lwip_topic/100"...
Subscribed to the topic "lwip_other/#".
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
MQTT client "lwip_client-123" not connected.

after sending one or two messages it continuously says not connected. So whats may gives a problem. Please help me to find the solution?

Thanks & Regards,

Prasanth

Re: Problem in MQTT

kerryzhou — Tue, 10 Sep 2019 03:27:32 GMT

Hi prasanth R ,

Please tell me which SDK example you are using?

Please give me that example code path in the SDK, then I will help you to check it.

Have a great day,
Kerry

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Re: Problem in MQTT

prasanthapplied — Tue, 10 Sep 2019 10:50:03 GMT

Hi Kerry,

SDK Version is 2.6.1.

Example code path is "C:\Users\AA-PDEE21\Documents\MCUXpressoIDE_11.0.0_2516\workspace\evkmimxrt1064_emwin_gui_demo"

Thanks & Regards,

Prasanth

Re: Problem in MQTT

kerryzhou — Wed, 11 Sep 2019 05:28:22 GMT

Hi prasanth R,

Do you mean this project:

SDK_2.6.1_EVK-MIMXRT1064\boards\evkmimxrt1064\emwin_examples\emwin_gui_demo

But this example just he emwin with LCD, it doesn't have the MQTT code.

Please help double check it, you you really use this example?

Or do you run this code:

\SDK_2.6.1_EVK-MIMXRT1064\boards\evkmimxrt1064\lwip_examples\lwip_mqtt

Kerry

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Re: Problem in MQTT

prasanthapplied — Thu, 12 Sep 2019 04:19:59 GMT

Sorry mistakenly i updated wrong directory. The directory is "C:\Users\AA-PDEE21\Documents\MCUXpressoIDE_11.0.0_2516\workspace\evkmimxrt1064_lwip_mqtt_freertos". Please check this.

Re: Problem in MQTT

kerryzhou — Thu, 12 Sep 2019 05:04:49 GMT

Hi prasanth R,

Thanks for your updated information, you should import the code from this SDK path:

SDK_2.6.1_EVK-MIMXRT1064\boards\evkmimxrt1064\lwip_examples\lwip_mqtt\freertos

Could you tell me which MQTT testing server you are using? MQTT fx or others, do you connect it successfully, can you also share some screen about it?

Kerry

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Re: Problem in MQTT

prasanthapplied — Thu, 12 Sep 2019 06:12:10 GMT

Hi Kerry,

I didn't change mqtt server. I used the same what was given from an example code.

After first page frequently it says "lwip_client-123" not connected. But i didn't have any internet issues.

Thanks & Regards,

Prasanth.

Re: Problem in MQTT

kerryzhou — Thu, 12 Sep 2019 09:09:34 GMT

Hi Prasanth.,

Thanks for your updated information.

I will test this code on my side, and give you updated information later, please give me more time.

Kerry

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Re: Problem in MQTT

prasanthapplied — Thu, 12 Sep 2019 09:56:02 GMT

Okay Sure.

Re: Problem in MQTT

prasanthapplied — Tue, 24 Sep 2019 03:37:05 GMT

Dear Kerry,

How long will you need to test the code?

Prasanth

Re: Problem in MQTT

arimendes — Thu, 24 Oct 2019 01:26:25 GMT

Kerry,

I've just downloaded the SDK_2.6.1EVK-MIMXRT1064 and I didn't find the lwip mqtt example in the path: \SDK_2.6.1EVK-MIMXRT1064\boards\ev mimxrt1064\lwip examples\lwip mqtt

Do I have to add something more than the lwip component to have lwip mqtt example?

Ari.

Re: Problem in MQTT

prasanthapplied — Thu, 24 Oct 2019 05:52:08 GMT

Dear Kerry,

I drag and dropped the sdk to MCUXpresso Installed SDK window the select the project using Import SDK Example which is available at the Quick start panel. then i select the board and lwip and lwip mqtt. I attached a screenshot to it.

I didn't download or install more than this.

Thanks & Regards,

Prasanth.

Re: Problem in MQTT

kerryzhou — Thu, 24 Oct 2019 09:13:38 GMT

Hi Ari Mendes,

When you generate the SDK, please select all the middleware component:

Then you will find the mqtt project.

Best Regards,

Kerry

Re: Problem in MQTT

kerryzhou — Thu, 24 Oct 2019 09:18:00 GMT

Hi prasanth R,

Sorry for my later reply, really a lot busy recently.

I have checked it on my side these days, but my company's website is secured, so I can't test the MQTT project directly, I need to buy the Rounter, and use the mobile 4G through the Rounter to get the unsecure network for Ethernet, I already buy the Rounter, but still didn't receive it, maybe still need more time.

Anyway, I will also help you to check it with our SDK testing team, this project should works, just like the readme.text test result.

Any updated information from my side, I will let you know.

Thanks a lot for your understanding.

Have a great day,
TIC

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Re: Problem in MQTT

prasanthapplied — Fri, 25 Oct 2019 04:08:08 GMT

Dear Kerry,

Okay sure. Take your time and update me.

Thanks & Regards,

Prasanth.

Re: Problem in MQTT

prasanthapplied — Fri, 25 Oct 2019 04:09:00 GMT

Dear Kerry,

Already i download the SDK with all the software components.

Re: Problem in MQTT

kerryzhou — Mon, 02 Nov 2020 14:28:50 GMT

Hi prasanth R,

The download reply if used for Ari Mendes, I know you already get it.

Today, I have finished my test platform, I test it, and reproduce your problem, it seems, it is not stable, this is my test result:

Initializing PHY...

************************************************
 MQTT client example
************************************************
Getting IP address from DHCP...

IPv4 Address     : 192.168.43.199
IPv4 Subnet mask : 255.255.255.0
IPv4 Gateway     : 192.168.43.1

Resolving "test.mosquitto.org"...
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
Going to publish to the topic "lwip_topic/100"...
Going to publish to the topic "lwip_topic/100"...
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
Going to publish to the topic "lwip_topic/100"...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
Going to publish to the topic "lwip_topic/100"...
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
Going to publish to the topic "lwip_topic/100"...
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
Received 6 bytes from the topic "lwip_topic/100": "123456"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
Received 6 bytes from the topic "lwip_topic/100": "123456"
Received 6 bytes from the topic "lwip_topic/100": "123456"
Received 6 bytes from the topic "lwip_topic/100": "123456"
Received 6 bytes from the topic "lwip_topic/100": "123456"
Received 6 bytes from the topic "lwip_topic/100": "123456"
Received 6 bytes from the topic "lwip_topic/100": "123456"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
Received 6 bytes from the topic "lwip_topic/100": "123456"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Subscribed to the topic "lwip_other/#".
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

Sometimes connected, sometimes not connected, then I use the MQTT.FX to test the test.mosquitto.org, the publish and subscribe is working.

From the printf log, we also find:

Sometimes, the RT board subscribe can receive the data which is published by the mqtt.fx.

About this detail problem, I will check it with our related department, I will give more reply in the next week.

Please keep more patient, thanks.

Have a great day,
Kerry

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Re: Problem in MQTT

prasanthapplied — Sat, 26 Oct 2019 05:50:59 GMT

Dear Kerry,

This is exactly the same problem what I face. I will wait for your reply.

Thanks & regards,

Prasanth.

Re: Problem in MQTT

kerryzhou — Mon, 28 Oct 2019 08:33:41 GMT

Hi prasanth R,

Today, I test it again on my side, this is my test result:

You can find, it can publish and receive the data, but just sometimes, it disconnected:

You can test it again, whether you can receive the data and publish the data again?

Initializing PHY...

************************************************
 MQTT client example
************************************************
Getting IP address from DHCP...

IPv4 Address     : 192.168.43.200
IPv4 Subnet mask : 255.255.255.0
IPv4 Gateway     : 192.168.43.1

Resolving "test.mosquitto.org"...
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Going to publish to the topic "lwip_topic/100"...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
Going to publish to the topic "lwip_topic/100"...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
Going to publish to the topic "lwip_topic/100"...
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
Going to publish to the topic "lwip_topic/100"...
Published to the topic "lwip_topic/100".
Received 18 bytes from the topic "lwip_topic/100": "message from board"
Going to publish to the topic "lwip_topic/100"...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
MQTT client "lwip_client-123" not connected.
Connecting to MQTT broker at 5.196.95.208...
MQTT client "lwip_client-123" connected.
Subscribing to the topic "lwip_topic/#" with QoS 0...
Subscribing to the topic "lwip_other/#" with QoS 1...
Subscribed to the topic "lwip_topic/#".
Received 4 bytes from the topic "lwip_topic/100": "8888"
Subscribed to the topic "lwip_other/#".
Received 4 bytes from the topic "lwip_other/10": "3333"
MQTT client "lwip_client-123" not connected.
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

About this problem, I also have talked it with our SDK testing team, they have meet the similar problem in the previous time, but after talking to the project owner, the owner didn't produce the problem.

Now, our testing team help us to test the newest SDK again, they also reproduce the disconnect problem, they already help tol report the bug to the SDK R&D department again.

Anyway, if I get any valuable information from our internal side, I will let you know.

From my today's test result, at least, the code can do the publish and subscribe function, when I use the MQTT to publish the data, the RT board also can receive it. So, you can test it again. From our original post, it seems, you can receive nothing, that really a problem, and different with my latest result.

Have a great day,
Kerry

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Re: Problem in MQTT

prasanthapplied — Tue, 29 Oct 2019 05:25:11 GMT

Dear Kerry,

I tested the same code again. Now it works fine not disconnected. I don't know how this happened. I attached a screenshot for your reference.