While browsing and reading the source code of the Heltec_ESP32 library, I found LORAWAN_PREAMBLE_LENGTH=8 as the default setting and have now removed it from platform.ini
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You now have the option of generating the devEUI randomly or from the chipId. In addition, for appEUI and devEUI, bits 0 and 1 of byte 0 are set according to the post: DevEUI for non-hardware assigned values - #23 by terrillmoore.
I will work on entering the EUIs and the key via the serial interface over the weekend.
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