Dear Sir,
We are a small R & D company, based in Bulgaria, Europe.
We specialize in developing Embed systems based ST(STM32), Microchip (Atmel )(PICs,AVR,Atmel ARM) and TI (MSP430) MCPUs and peripheries.
For our mobile devices use ESP32 and nRF51/52xxx BLEs.
We realize projects with requirements similar to yours based STM32 blue pill.
Our tools for design (migrate Arduino code STM32 based systems) are:
Keil ARM
Atollic TRUEStudio
STM32 blue pill boards - 2 st in office.
ST LINK debugger programmer for STM32.
If we receive more information about your project(Do you have Arduino code ?), we will give you a real cost and time to implement your project.
We based in Europe, not customs problems for delivery models and samples for testing or paralel testing via TeamViewer.
Best
Valeri T.