# No join response for tabs temperature sensor

**URL:** <https://www.thethingsnetwork.org/forum/t/no-join-response-for-tabs-temperature-sensor/34767>\
**Category:** End Devices (Nodes)\
**Created:** [February 24, 2020, 11:43am UTC](https://www.thethingsnetwork.org/forum/t/no-join-response-for-tabs-temperature-sensor/34767 "2020-02-24T11:43:47Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![arjanvanb](https://www.thethingsnetwork.org/forum/user_avatar/www.thethingsnetwork.org/arjanvanb/32/46626_2.png) [@arjanvanb](https://www.thethingsnetwork.org/forum/u/arjanvanb)\
**Post date:** [February 24, 2020, 12:52pm UTC](https://www.thethingsnetwork.org/forum/t/no-join-response-for-tabs-temperature-sensor/34767/2 "2020-02-24T12:52:54Z")

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> [@flipnussi](#):
>
> And the request has an encoded payload field, which contains a dev nonce value, which gets incremented with every join message.

TTN will record and reject all DevNonces the device ever used before, so make sure you’re not testing with values that start at zero. See [OTAA shows "Activation DevNonce not valid: already used" - #13 by arjanvanb](https://www.thethingsnetwork.org/forum/t/otaa-shows-activation-devnonce-not-valid-already-used/5079/13) for a workaround. (Also, an incremental DevNonce sounds like a LoRaWAN 1.1 device. The TTN community network uses 1.0.2, but 1.1.x devices should be backwards compatible.)

> [@flipnussi](#):
>
> The request contain the dev eui, app eui and app key (and the values are correct, just like the ones i used to register that sensor device - i already checked that multiple times…)

A Join Request should not hold the secret AppKey. It should include a MIC (calculated using the secret AppKey), like any message. Is that what you mean, and is that what you validated to be correct? You can validate the MIC of an OTAA Join Request [using this online decoder](http://runkit.io/avbentem/lorawan-packet-decoder/branches/master) and set a dummy value for NwkSKey, and paste your AppKey as known in TTN Console as the AppSKey.

Do you think that the AppEUI and DevEUI you got with the device are unique? ([They should be](https://www.thethingsnetwork.org/forum/t/dragino-lht65-and-network-coverage/31434/12). And they are not secret.)

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