# Arduino nano and RFM95 basic test - EV\_JOIN\_TXCOMPLETE: no JoinAccept

**URL:** <https://www.thethingsnetwork.org/forum/t/arduino-nano-and-rfm95-basic-test-ev-join-txcomplete-no-joinaccept/40058>\
**Category:** LMIC\
**Created:** [September 21, 2020, 7:08pm UTC](https://www.thethingsnetwork.org/forum/t/arduino-nano-and-rfm95-basic-test-ev-join-txcomplete-no-joinaccept/40058 "2020-09-21T19:08:50Z")\
**Posts on this page:** 1\
**Showing post:** 103

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**Author:** ![bluejedi](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/bluejedi/32/44639_2.png) [@bluejedi](https://www.thethingsnetwork.org/forum/u/bluejedi)\
**Post date:** [October 15, 2020, 9:50am UTC](https://www.thethingsnetwork.org/forum/t/arduino-nano-and-rfm95-basic-test-ev-join-txcomplete-no-joinaccept/40058/103 "2020-10-15T09:50:35Z")

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> [@arjanvanb](#):
>
> Anyway: I simply don’t know if _your_ LMIC library uses MSB or LSB for ABP. (It surely used LSB for OTAA.) So unless the above is actually documented for the LMIC you’re using, maybe your LMIC expects LSB? Easily checked, I’d say?

Easily checked indeed:

[Format of Keys and ID’s for Arduino LMIC libraries [HowTo]](https://www.thethingsnetwork.org/forum/t/format-of-keys-and-ids-for-arduino-lmic-libraries-howto/28243)

Above holds for both for Classic LMIC and MCCI LMIC.

> I simply don’t know if _your_ LMIC library uses MSB or LSB for ABP.

If the LMIC library used is different than Classic LMIC and MCCI LMIC then I would suggest to use and test with either of these libraries in the first place.

  

_For information about naming see: [Arduino LMIC library naming: Classic LMIC and MCCI LMIC [HowTo]](https://www.thethingsnetwork.org/forum/t/arduino-lmic-library-naming-classic-lmic-and-mcci-lmic-howto/40592)_

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