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Introduction Have you ever wondered what it takes to build good IoT product? How much effort does it take to create useful solution which will work safely and serve many clients? It can take a lot of time to do it. Fortunately there are some services like Google Cloud IoT or Amazon AWS IoT which try to help developers overcome all of common obstacles and make the work much easier. Today we will talk more closely about Amazon services. The main goal of their platform which was launched in 2015 is to offer tools that will help to spend more time on product development and not on common tasks that could be easily automated.
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MQTT (the acronym that, apparently, shouldn’t be expanded to Message Queue Telemetry Transport anymore) is a communication protocol focused on energy efficiency, data-transfer minimization, and assurance of delivery. These three qualities make it the perfect choice for any Internet of Things projects where the Internet connection is given but can be unreliable. Definitions aside, we can use MQTT for:
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MQTT Overview For Developers

Message Queue Telemetry Transport is a lightweight messaging protocol for small sensors and mobile devices, optimized for high-latency or unreliable networks. It works on top of the TCP/IP protocol. It has been used in sensors communicating to a broker via satellite link, over occasional dial-up connections with healthcare providers, and in a range of home automation and small device scenarios. It is also ideal for mobile applications because of its small size, low power usage, minimised data packets, and efficient distribution of information to one or many receivers. These qualities, along with reliability and some degree of assurance of delivery makes it a worth-to-consider solution in “machine-to-machine” (M2M) or “Internet of Things” products.
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MQTT iOS Frameworks Comparison

If you are new to the MQTT or just want to refresh your knowledge, please read my overview of the technology first. The first step to build a stable and reliable iOS application with use of the MQTT protocol is to take some time to determine all use cases and possible scenarios. Based on that the expected sp ecification can be created for the second step - choosing the right broker. The implementation of it on the server is not a task for iOS developer, but it’s important to know what are its functionalities and limitations. Only after that, the proper framework for iOS can be chosen. There are lots of the MQTT clients available. I had an experience with two of them: CocoaMQTT and MQTT-Client-Framework. However, there is also a third very tempting option, which is Moscapsule. The purpose of this blog post is to compare all three of them especially in terms of differences.
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