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What is Mbed?
Arm Mbed OS is an open source embedded operating system designed specifically for the "things" in the Internet of Things.
Development boards
Using the Online Compiler
the Arm Mbed APIs
An introduction to Arm Mbed OS 5
Arm Mbed OS quick start
Mbed OS
Arm Mbed OS is a free, open-source embedded operating system designed specifically for the "things" in the Internet of Things.
It includes all the features you need to develop a connected product based on an Arm Cortex-M microcontroller, including security, connectivity, an RTOS, and drivers for sensors and I/O devices.

Mbed OS