EZ Link Bluefruit with ESP32 Arduino Upload Test

we're trying to revive the old EZ-Link Bluefruit design from many years ago - originally done with a CSR chipset that became very hard for us to get. ESP32 is a lot easier and the original chip has BT classic support - required for BT SPP which is what we're using. This test uses the Arduino IDE, we are uploading code from the IDE 'transparently' to the COM port which the operating system makes when you pair to a BT SPP profile device. Since we pass the baud rate and control lines, we're able to auto-reset and transmit data as if it were connected with a USB cable! here, we're uploading a NeoPixel test sketch and it seems to be working
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