Contents
Where are Mosquitto messages?
1 Answer
- Yes, there is a file (mosquitto.db).
- Messages are stored as long as there are persistence sessions and the limit is disk space (or possibly 2-4gb for 32bit mosquitto).
- It depends on you message rates and the number of publishers/subscribers.
How do I view Mosquitto logs?
If you look in the /var/log/mosquitto folder you will see the mosquitto. log file and zipped archives.
What are MQTT retained messages?
A retained message is a normal MQTT message with the retained flag set to true. Each client that subscribes to a topic pattern that matches the topic of the retained message receives the retained message immediately after they subscribe. The broker stores only one retained message per topic.
What is Mosquitto RR?
mosquitto_rr is an MQTT version 5/3.1. 1 client that can be used to publish a request message and wait for a response. When using MQTT v5, which is the default, mosquitto_rr will use the Request-Response feature.
Where do I find my log messages in Mosquitto?
Normally you will view these logs on the Mosquitto broker console but you can also view them using an MQTT client if you have logged them to a topic. If you send the log messages to topic they are sent to the $SYS/broker/log topic ,and you need to subscribe the topic tree $SYS/broker/log/#.
How does Mosquitto _ sub work in MQTT version 3.1?
Description mosquitto_sub is a simple MQTT version 3.1.1 client that will subscribe to topics and print the messages that it receives. In addition to subscribing to topics, mosquitto_sub can filter out received messages so they are not printed (see the -T option) or unsubscribe from topics (see the -U option).
How to connect Mosquitto server to Windows 10?
Go to your client machine (in my case a Windows 10 laptop) and run the MQTT client, connecting to the local address of the Linux Mosquitto server (in my case 192.168.0.144). You should be able to connect.
Is there a way to unsubscribe from topics on Mosquitto?
In addition to subscribing to topics, mosquitto_sub can filter out received messages so they are not printed (see the -T option) or unsubscribe from topics (see the -U option). Unsubscribing from topics is useful for clients connecting with clean session set to false. mosquitto_sub supports TLS encrypted connections.