Hi, my project is about the RFID it will detected by the MQTT node named RFID Collection. But My RFID is run with NodeMCU and has been coded as below using Arduino and it works well as displayed in the COM Serial, the RFID is detected but not in the Node Red. I want the RFID to be detected and chan…

Have you tested the broker on your raspberry pi can be connected to from a networked computer? What type and version broker are you running on the raspberry?

its mosquitto version 1.5.7 1624659078: mosquitto version 1.5.7 starting 1624659078: Using default config. 1624659078: Opening ipv4 listen socket on port 1883. 1624659078: Error: Address already in use

[image] nurulh1909: 1624659078: Error: Address already in use This could be problematic.

[image] Colin: sudo netstat -ltnp | grep -w ':1883' tcp6 0 0 :::1883 :::* LISTEN 502/mosquitto

$ sudo apt install net-tools E: dpkg was interrupted, you must manually run 'sudo dpkg --configure -a' to correct the problem.

sudo dpkg --configure -a Setting up apache2 (2.4.38-3+deb10u4) ... Configuration file '/etc/apache2/apache2.conf' ==> File on system created by you or by a script. ==> File also in package provided by package maintainer. What would you like to do about it ? Your options are: Y or I : install…

[image] nurulh1909: its mosquitto version 1.5.7 its mosquitto version 1.5.7

ok, so can you access the mosquito broker from an external computer using an MQTT client (e.g. MQTT Explorer). Do you see a topic home/levelsensor ? Are you publishing a value to home/levelsensor? from somewhere? Is the IP/username/password set correctly in your c code? const char* ssid = "Andr…

yes , there is home/levelsensor somewhere else in another node red flow.

RFID is not detected in Node Red

General

Colin 26 June 2021 07:51 5

The port is already in use. Do you have another broker running already?
What does the command
sudo netstat -ltnp | grep -w ':1883'
show? If it says the command is not found then run
sudo apt install net-tools
to install it.

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RFID is not detected in Node Red

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