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| Developer | Apache Software Foundation, community |
|---|---|
| Written in | C (Mynewt OS) Go (Newt Tool) |
| Working state | Stable |
| Source model | Open-source |
| Latest release | 1.11.0 / September 7, 2023; 18 months ago (2023-09-07)[1] |
| Repository | github |
| Platforms | Cortex-M0,Cortex-M3,Cortex-M4,Cortex-M7,MIPS32,Microchip PIC32,RISC-V |
| License | Apache License 2.0 |
| Official website | mynewt |
Apache Mynewt is a modularreal-time operating system for connectedInternet of things (IoT)[2] devices that must operate for long times under power, memory, and storage constraints. It isfree and open-source software incubating under theApache Software Foundation,[3] withsource code distributed under theApache License 2.0, a permissive license that is conducive to commercial adoption ofopen-source software.[4]
Apache Mynewt is a real-time operating system with a rich set oflibraries intended to make prototyping, deploying, and managing 32-bitmicrocontroller basedIoT devices easy.[5] It is highly composable, to allow buildingembedded system applications (e.g., locks, medical devices, industrial IoT) across different types of microcontrollers. The nameMynewt is wordplay on the English wordminute, meaning very small: the kernel is only 6 KB in size.
The OS is designed for connectivity, and comes with a full implementation of theBluetooth low energy 4.2 stack. With the addition of BLE (supporting all Bluetooth 4.2 compliant security features except privacy) and various utilities such as the default file system, console, shell, logs, stats, etc., the image size is approximately 96 KB for the Nordic nRF51822 Bluetooth SoC.[6] This size metric excludes theboot loader image.
The core operating system supports:[3]
Other features and utilities include:
The first network stack available in Mynewt is Bluetooth low energy[7] and is called NimBLE. It complies with Bluetooth Core Specification 4.2.[8]
NimBLE includes both the host and controller components. Access to the controller source code makes the BLE performance highly configurable. For example, the BLE throughput can be adjusted by changing the connection intervals, data packet size, packet queue size etc. A use case requiring a large number of concurrent connections can similarly be configured, provided there is adequate RAM allocated. Example applications that demonstrate how to use available services are included in the package.
Theoperating system is designed forcross-platform use inembedded systems (devices) and microcontrollers. It includes board support packages for the following, as of July 2023[update]:[9]
The project includes the Newt Tool which is acommand-line interface (CLI) based smart sourcepackage manager system for embedded systems development. Also, it allows composing builds with specified packages and compiler options, generating images and their digital signatures, and finally downloading and debugging the firmware on different targets.
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