I didn't see that mentioned - if so, that's great - but it could be similar to the WICED in that while it's an STM32, you really have* to run under their RTOS, which means directly accessing the hardware is more of a pain.
On WICED it seems you don't have to use their RTOS, it just seems painful not to.
Espruino is a JavaScript interpreter for low-power Microcontrollers. This site is both a support community for Espruino and a place to share what you are working on.
I didn't see that mentioned - if so, that's great - but it could be similar to the WICED in that while it's an STM32, you really have* to run under their RTOS, which means directly accessing the hardware is more of a pain.