@gsuberland reminder that every somehow springy contact bounces, for example a mcu plugged in and powered by usb, ergo brown-out detector used for waiting for voltage to settle
WirelessNetworkTransceiver/samd21g18a/syscalls.c at master · DO3RB/WirelessNetworkTransceiver
Reliable Radio Communications using run-length limited Golaycodes over ISM Transceivers at maximum baudrate, all packaged as USB Ethernet adapter - DO3RB/WirelessNetworkTransceiver