RAK2270 cannot send uplink to TTN error: DevNonce too small

[huy (tran)]

I have executed AT+JOIN command to RAK join to TTN

Arduino IDE:

AT+JOIN
+EVT:JOIN_FAILED_RX_TIMEOUT
Join status: 4
+EVT:JOIN_FAILED_RX_TIMEOUT
Join status: 4
+EVT:JOIN_FAILED_RX_TIMEOUT
Join status: 4
+EVT:JOIN_FAILED_RX_TIMEOUT
Join status: 4

Live Data TTN:

" dev_nonce_too_small "

Here is my TTN configuration

I checked all the keys on the device, Frequency (AS923_2), OTAA and they are all correct. I don’t know what is causing me to not be able to send uplink packets to TTN
I will provide more information if you need it.
Hope everyone will help me. Thanks !

[carlrowan]

Welcome to RAK forum @huy ,

Please use version LoRaWAN version 1.0.3. The current sticker doesn’t support 1.0.4 yet. That’s causes that error.

[huy (tran)]

hi @carlrowan

Thanks for answering my question !

I am using Asian frequency 920 - 923 MHz (AS923 Group 2) with default channels only and no LoRaWAN version 1.0.3 support

[huy (tran)]

@carlrowan You can see the options to configure, they don’t have version 1.0.3
Thank !

[carlrowan]

To use it, you can try to enable automatic reset of join nonces. Click on Reset used DevNonces as well. You can find this in the device setting under join setting.

[carlrowan]

If you are using the latest RAK2270, it will try to rejoin every 4 hours. You might need to wait for its automatic rejoin.

[huy (tran)]

hi @carlrowan
Good afternoon Sir !

I implemented your solution but it doesn’t seem to work

The image below will show us that the device has sent an Uplink packet to TTN but for some reason the device cannot send a second packet to TTN and reports an error “DevNonse is too small”

Thanks Sir !

[carlrowan]

Hi @huy ,

I did test on my device and it works. Few things to check.

1. Confirm if the Resets join nonces are really checked then click again Reset used DevNonces.
2. Delete the device and register again using the same credentials. Also perform the suggested Resets for the Nonces.
3. How far are you from the gateway? Do you have good RSSI and SNR readings on the join request? It can also be possible that the downlink join request wasn’t received if you are far from the gateway. All uplinks that I see are join request.

[huy (tran)]

Hi @carlrowan

1. After selecting Reset used DevNonces, I performed AT+JOIN
   serial monitor arduino IDE:

RAK2270 SW Version: RAK2270_1.1.0_Generic
FACTORY_MODE: ON(255)
Uplink period is 1 minutes
Battery Voltage: 3.00
NTC_Temp.: inf
ACT_CHECK: Activated(0)!!!
Current Work Mode: LoRaWAN.
OK
+EVT:JOIN_FAILED_TX_TIMEOUT
Join status: 2
OK
+EVT:JOIN_FAILED_TX_TIMEOUT
Join status: 2

2. I did this on another device and then it didn’t activate (I made sure all JoinEUI, AppEUI, AppKey were correct)

3. I live very close to Gateway just 5 meters

I did erase and flash a firmware from the new RAK ( RAK3172-E_latest_final.hex) publisher but this also can not work
Can you help me check again?
Thanks Sir !

[carlrowan]

Hi @huy ,

The reset devnonce should work. Sometimes there is problem on UI of TTN so you might need to do it twice or thrice.

I did a screen capture of 1.0.4 failing on devnonce too small and fixed by enabling devnonce reset.

TTN Sticker Devnonce Reset Demo

[huy (tran)]

hi @carlrowan

Now, my device can not send activation command to TTN. previously i tried deleting the application and recreating with the addresses:
DevEUI: AC1F09FFFE1050E3
JoinEUI0000000000000000

I have checked these keys on the device using AT+DEVEUI, AT+JOINEUI, AT+APPKEY commands and they are exactly the same as TTN. I don’t understand why the device can’t send a device activation request to TTN (Lorawan Gateway uses AS923_2 frequency)

[carlrowan]

I just realized now that your problem is not devnonce anymore.

It can be that you are using a wrong FW. You use RAK3172 and not RAK3172-SiP.

Here’s the link for the RAK3172-SiP which is inside the sticker.

[huy (tran)]

I will try flashing the firmware you sent with STM32PROGRAMMER. i will reply later if there is good progress

Thanks Sir @carlrowan !

[carlrowan]

If you upload that, that is empty FW. You can do some test there.

If you want now the RAK2270 FW, please use this - RAK2270-Sticker-Tracker/Firmware/Release/RAK2270_1.1.0_Generic/RAK2270_1.1.0_Generic.hex at main · RAKWireless/RAK2270-Sticker-Tracker · GitHub

You can also use Arduino to upload and compile the open source FW of RAK2270. We did extensive testing on RUI3 v4.1.1 so that’s what I will recommend. However, it only supports LoRaWAN v1.0.3. Here’s the repo link - RAK2270-Sticker-Tracker/Firmware/RAK2270 at main · RAKWireless/RAK2270-Sticker-Tracker · GitHub

[huy (tran)]

I solved the problem i was having. now it works fine
maybe i used wrong firmware, after flashing the FW(RAK2270-Sticker-Tracker/Firmware/Release/RAK2270_1.1.0_Generic/RAK2270_1.1.0_Generic.hex at main · RAKWireless/RAK2270-Sticker-Tracker · GitHub) my device sent Uplink to TTN successfully. Thank you very much !!!

@carlrowan Have a good day Sir !!!