bravokeyl
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When and why to use MQTT protocol?
22 votes

MQ Telemetry Transport Protocol known as MQTT is designed for devices which run on low power and low bandwidth. It is a lightweight publish/subscribe messaging protocol which means any other device ...

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Can an MQTT client subscribe to a topic created by itself?
Accepted answer
19 votes

Yes, it is possible to subscribe to a topic that is created by itself. An MQTT client can be both a publisher & subscriber at the same time. In MQTT terms, a client includes both subscribers and ...

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Mosquitto on Raspberry Pi refuses connection after changing log settings
6 votes

The log directory/file should be owned by the mosquitto user or the user that you have setup in the conf file and group. I tried with two conf files one with out log_dest file /var/log/mosquitto/...

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What happens after my Google business email expires?
3 votes

Even though I think you get better answers at Web Applications SE. I can give you some info. But how about my email data, can I export it? As per support docs, if your trial period ends, you will ...

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What IoT services are available for storing/sending/publishing generic data in the cloud?
7 votes

Many cloud providers like Amazon, Microsoft, Google, IBM etc., trying to attract IoT space by providing easier ways to send/store/analyze sensors data to their cloud. Even they are to acquire hardware ...

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Don’t subscribe to # - so how to dump all messages to database with Mosquitto?
Accepted answer
12 votes

a similar system (extension/plugin) for the mosquitto broker As far as I know there is no plugin/extension for mosquitto broker ( at least no opensource one ) another recommended method that works ...

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Is there a way to preserve the MQTT QoS level until it reaches the client?
Accepted answer
8 votes

One thing to remember when working with MQTT is that "both subscribers and publishers are considered MQTT clients". As said QoS set while publishing is entirely related to broker(B) not the other ...

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My home monitoring camera sends me thousands of e-mails every day
3 votes

I don't have the setup in question with me but I try to answer in general. Normally any sensor that detects changes in motion depends on the configuration that we set for sensitivity, threshold. I ...

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Is the Subscriber-Publisher pattern applicable also to actuators?
Accepted answer
10 votes

But how about actuators? Yes pub-sub pattern is applicable to actuators. Is this the way to go with actuators? This is one of the ways to go and this is booming because of many cloud providers ...

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What is the difference between IoT and "Industry 4.0"?
11 votes

Industry 4.0 is the latest trend in manufacturing industries to utilize the power of cloud computing over securely connected devices (IoT) and algorithm controlled mechanical systems. Is "Industry ...

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How do I shut down IoT devices without a power button?
15 votes

What is the preferred way to disconnect them from power? What if there is a power cut? I assume you are talking about devices which act as gateways to aggregate and send it to the cloud (for e.g.: ...

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How can I implement MQTT on an STM32F030K6T6?
Accepted answer
12 votes

Is it possible to implement MQTT on this device? Any device that has TCP/IP layer can implement MQTT. What requirements should a microcontroller match to be able to use/run MQTT? You need to ask ...

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