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    Can't connect NodeMCU with MQTT

    Arduino
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    • salmanfaris
      salmanfaris @sivanath last edited by

      @sivanath Does the local pub and sub is working over CLI?

      S 1 Reply Last reply Reply Quote 0
      • S
        sivanath @salmanfaris last edited by

        @salmanfaris It was working in CLI, but now it's showing multiple usages at the portmultiple usage.png

        swalahamani 1 Reply Last reply Reply Quote 0
        • swalahamani
          swalahamani @sivanath last edited by swalahamani

          @sivanath

          It looks like mosquitto is trying to register both IPv4 and IPv6 on the same port.

          If IPv6 is not required for the application your use case, try changing the mosquitto.conf file as below for limiting it to ipv4:

          # Set to `ipv4` to force the listener to only use IPv4, or set to `ipv6` to
          # force the listener to only use IPv6. If you want support for both IPv4 and
          # IPv6, then do not use the socket_domain option.
          socket_domain ipv4
          

          Please please make sure the default port 1883 is not already in use by any other programs. If yes, you can either kill those programs (not recommended) or change the port in mosquitto.conf file:

          References: [1][2]

          S 1 Reply Last reply Reply Quote 0
          • S
            sivanath @swalahamani last edited by sivanath

            @swalahamani @salmanfaris
            I changed my conf file and specified ipv4
            And this is the status of the port (from resource monitor):

            Image: mosquitto.exe	
            PID: 3732
            Address: IPv6 loopback
            Protocol: TCP
            Port: 1883
            Firewall Status: Allowed, not restricted
            
            

            It is listening to mosquito..

            swalahamani 1 Reply Last reply Reply Quote 0
            • swalahamani
              swalahamani @sivanath last edited by

              @sivanath

              Is it working now?

              S 1 Reply Last reply Reply Quote 0
              • S
                sivanath @swalahamani last edited by

                @swalahamani No Screenshot 2023-03-30 132054.png

                swalahamani 1 Reply Last reply Reply Quote 0
                • swalahamani
                  swalahamani @sivanath last edited by

                  @sivanath
                  Did you follow the steps which I mentioned previously?

                  S 1 Reply Last reply Reply Quote 0
                  • S
                    sivanath @swalahamani last edited by

                    @swalahamani Yeah!!

                    swalahamani 1 Reply Last reply Reply Quote 0
                    • swalahamani
                      swalahamani @sivanath last edited by swalahamani

                      @sivanath

                      Oh okay.

                      Please bring your device if you're coming for the upcoming MakerChat 0x13 tomorrow (IST). Either I and @salmanfaris or both of us will be there.

                      Or else we can set up a call sometime this weekend or the next week and sort it out.

                      Let me know.

                      S 1 Reply Last reply Reply Quote 1
                      • S
                        sivanath @swalahamani last edited by

                        @swalahamani I may not be able to come tomorrow. I think we could set up a call. How can I contact you personally?

                        salmanfaris 1 Reply Last reply Reply Quote 0
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                        • @codelery Awesome. That's great news. Kudos to @rafitc99 . 🙌

                          @codelery Please keep us updated about your project, looking forward to seeing it in action 🤩

                          • read more
                        • C

                          @rafitc99 I changed the buffer and that solved the problem. Thanks a lot for coming to my rescue.

                          • read more
                        • C

                          @salmanfaris I did change the buffer size and everything is working perfectly. Thanks coming to my rescue.

                          • read more
                        • @codelery said in Help needed: Arduino Wireless Notice Board project:

                          I am using the hardware serial (pin 0 and 1 on Arduino Uno)

                          As @rafitc99 mentioned, you need to expand the Serila buffer, in the hardware serial also the Arduino board package implements a 64-byte ring buffer for send and receive on the hardware serial messages. So you need to change that to 256 as per your message length.

                          • read more
                        • C

                          @rafitc99 The thing is that I am not using the SoftwareSerial library in receiving the message from the first microcontroller. I am using the hardware serial (pin 0 and 1 on Arduino Uno)

                          • read more
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