MQTT Protocol

MQTT is a handy protocol for sending/receiving lightweight data.

What is MQTT

MQTT stands for MQ Telemetry Transport. It is a publish/subscribe, extremely simple and lightweight messaging protocol, designed for constrained devices and low-bandwidth, high-latency or unreliable networks. The design principles are to minimise network bandwidth and device resource requirements whilst also attempting to ensure reliability and some degree of assurance of delivery. These principles also turn out to make the protocol ideal of the emerging “machine-to-machine” (M2M) or “Internet of Things” world of connected devices, and for mobile applications where bandwidth and battery power are at a premium.

V5.0 and v3.1.1 are OASIS standards (v3.1.1 is also a standard for ISO)

Protocol

The standard ports for MQTT to use.

TCP/IP port 1883 is reserved with IANA for use with MQTT.
TCP/IP port 8883 is also registered, for using MQTT over SSL.

What security does MQTT support.

You can pass a user name and password with an MQTT packet in V3.1 of the protocol. Encryption across the network can be handled with SSL, independently of the MQTT protocol itself (it is worth noting that SSL is not the lightest of protocols, and does add significant network overhead). Additional security can be added by an application encrypting data that it sends and receives, but this is not something built-in to the protocol, in order to keep it simple and lightweight.

Opgaver i SKP

Alt efter hvornår du kommer i skolepraktik og udfra dit sidste skoleophold vil der her ligge opgaver som du bliver tildelt fra din instruktør.

Opgaverne er passet ind til sidste skoleforløb, så du får trænet din viden med praktiske opgaver.

Tjek ind

Opgaven lød på en nemmere måde at lave fraværsregistrering på, hvor eleverne selv kunne tjekke ind i SKP. Elever fra SKP programmørerne fik forskellige opgaver fra driver programmering til Windows og Linux til selve systemet til registrering af eleverne.

Softwaren er skrevet i forskellige sprog fra HTML, CSS og JavaScript til backend i PHP. Driverne er skrevet i Python og C#.

Opgaverne i backend indeholdt flere opgaver i sikker overførsel, database planlægning og håndtering af data i backend.

Benjamin Sørensen stod for udviklingen af første version af front- og backend. Anders Kaa stod for driver programmering til Windows 32 i C# og Kian stod for Linux driver i Python.

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