Gliax ECG firmware that simulates sending ECG data over some kind of USB interface

Import code from URL (https://github.com/IRNAS/gliax-ecg-simulation-firmware). Select option "Update all libraries to the latest revision". Select platform for which code will be compiled and hit "Compile" button. Online compiler will offer you to save hex file.

In order to compile the code localy, it is required to install mbed-cli and all dependency tools.
See: https://github.com/ARMmbed/mbed-cli
Then it is required to import code from GitHub:
$ mbed import https://github.com/IRNAS/gliax-ecg-simulation-firmware
After import is finished, execute mbed compile command with desired target and tools selected, for example:
$ mbed mbed compile -m SEEED_TINY_BLE -t GCC_ARM
Resulting hex file will be located in folder ./BUILD/SEED_TINY_BLE/GCC_ARM/

In order to download code to mbed platform, just copy hex file to the MBED drive.