https://github.com/carrascoacd/ArduinoSIM800L

Mean opinion score (MOS) is a measure used in the domain of Quality of Experience and telecommunications engineering, representing overall quality of a stimulus or system. It is the arithmetic mean over all individual “values on a predefined scale that a subject assigns to his opinion of the performance of a system quality”.[1] Such ratings are usually gathered in a subjective quality evaluation test, but they can also be algorithmically estimated.
MOS is a commonly used measure for video, audio, and audiovisual quality evaluation, but not restricted to those modalities. ITU-T has defined several ways of referring to a MOS in Recommendation P.800.1, depending on whether the score was obtained from audiovisual, conversational, listening, talking, or video quality tests.

Source: Mean opinion score – Wikipedia

Source: Xiaomi Mi Smart Home Kit: full specifications, photo | Xiaomi-Mi.com

Source: Welcome to Smart Home with QIVICON – QIVICON

Douglas Carl Engelbart (January 30, 1925 – July 2, 2013) was an American engineer andinventor, and an early computer and Internet pioneer. He is best known for his work on founding the field of human–computer interaction, particularly while at his Augmentation Research CenterLab in SRI International, which resulted in creation of the computer mouse, and the development of hypertext, networked computers, and precursors to graphical user interfaces. These were demonstrated at The Mother of All Demos in 1968. Engelbart’s Law, the observation that the intrinsic rate of human performance is exponential, is named after him.
https://en.m.wikipedia.org/wiki/Douglas_Engelbart

https://en.m.wikipedia.org/wiki/Stewart_Brand

L band is the Institute of Electrical and Electronics Engineers (IEEE) designation for the range of frequencies in the radio spectrum from 1 to 2 gigahertz (GHz).

Source: L band – Wikipedia

This tutorial is going to teach you basics on using Optical Dust Sensor.

Source: How to Interface With Optical Dust Sensor: 9 Steps (with Pictures)

Source: RFM12B-S2 Wireless Transceiver – 434MHz – WRL-09582 – SparkFun Electronics

Source: Cheap 433MHz Transmitters | Majenko’s Hardware Hacking Blog

Source: I2C Keypad – Hackster.io

The Radio Resource Control (RRC) protocol is used in UMTS and LTE on the Air interface. It is a layer that exists between UE and eNB and exists at the IP level. This protocol is specified by 3GPP in TS 25.331 for UMTS and in TS 36.331 for LTE. RRC messages are transported via the PDCP-Protocol.
The major functions of the RRC protocol include connection establishment and release functions, broadcast of system information, radio bearer establishment,reconfiguration and release, RRC connection mobility procedures, paging notification and release and outer loop power control. By means of the signalling functions the RRC configures the user and control planes according to the network status and allows for Radio Resource Management strategies to be implemented.

The operation of the RRC is guided by a state machine which defines certain specific states that a UE may be present in. The different states in this state machine have different amounts of radio resources associated with them and these are the resources that the UE may use when it is present in a given specific state. Since different amounts of resources are available at different states the quality of the service that the user experiences and the energy consumption of the UE are influenced by this state machine.

Source: Radio Resource Control – Wikipedia