I noticed there is a rosserial mbed library for Kinetic but not Melodic. Looking at Gary Servin's code repository on mbed the last update was Dec 2016. Will rosserial mbed be maintained or did support for this end with Kinetic?

Maybe a more general question is better. I have an STM32 based sensor and I want to let it publish to ROS. What is the best way? I'm I forced to use Arduino IDE?

This is for a new design robot and I have several cases of real-time hardware controls using STM32 ARM Cortex-M that need to connect with ROS.