Dear Sir,
We are a small R & D company, based in Bulgaria, Europe.
We specialize in developing Embedded 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.
For upload firmware target PCB based ESP32 WROM32D use FTDI,Serial and JTAG.
See my profile too
Our tools for design ESP32 based systems:
PlatformIO(VSC)
MS Visual Studio 201(visualGDB)
ESP-Prog
ESP32 DEV Kits
If we receive more information about your project, 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 use TeamVewer.
Best
Valeri T.