Broker Mosquitto has group of topics in which he publishes various information about his work. By subscribing to these topics, we can find out, for example, what the number of subscribers are now, or how many messages have been published or received since the start of the server. At the beginning of the check the […]
Tutorials
MQTT – Moquitto – access control
While our broker is located inside the home network does not threaten us that someone is not authorized subscribe, or publish something in our topics, but when the server will be available outside the network we need some secure. It would not be good if someone would not be allowed to control the light in […]
MQTT – Moquitto – installation and simple start
In the previous article I described the basic of the MQTT communication protocol, now I will discuss the practical use of communication using the Mosquitto broker. Mosquitto is a lightweight broker that supports the MQTT protocol provided by the Eclipse Foundation under the EPL/EDL license. Installing a Broker The following method will install Mosquitto on […]
Eagle – Problem with running on Debian 9
Reinstalling the operating system I decided to go back to Debian. Overall, everything on the plus except that the Eagle program did not want to run. After a manual attempt to start the terminal, a message appeared: $./eagle Terminate called after throwing an instance of ‘ std:: runtime_error ‘ What (): Locale:: facet:: _S_create_c_locale name […]
Phase detection system
Recently, during the project, there was a need to implement a system that was meant to signalize whether it is a phase or not. And that the system output signal is acceptable for the microcontroller. I have considered a few options that I’ll show below. It should be remembered that in the presented systems there […]
MQTT protocol
The MQTT communication protocol is based on the publication and subscription pattern. Its main advantage is lightness, so it can be implemented in very small microprocessor systems, and at low data transmission. MQTT was created by Andy Stanford-Clark and Mihaelaanca Nippera in 1999 year. The MQTT protocol is a special application in the IoT industry. […]