JOIN only once on Conduit AP

[Paul Fux]

Hello,

I think there is something wrong with my Conduit AP because all my lora devices join only once after a node-add. If I shut down the device, I have to delete the node and add it again. Does anyone have an idea why ?

Logs say :

mtcap lora-network-server: GW:00:80:00:00:00:01:08:2a|FRAME-RX|Parsing 1 packets
mtcap lora-network-server: ED:07-03-d5-e7-5e-00-36-ca|CHECK-PKT|FCNT: ffffffff LAST-FCNT: 00000002 Duplicate: no
mtcap lora-network-server: ED:07-03-d5-e7-5e-00-36-ca|CHECK-MIC|ADDR: 00:00:36:ca failed
mtcap lora-network-server: ED:07-03-d5-e7-5e-00-36-ca|DROP-PKT|Addr: 00:00:36:ca Duplicate: no

Best,

Paul

[Jason Reiss]

Are the devices joined via OTA or ABP?

How do you shutdown the device? Pulling power will not allow the database to be backed to flash.

The database is backed-up to flash on a 1 hour interval.

Try to backup the database after adding your nodes.
$ nc -u localhost -p 6677
database backup

There will still be an issue for downlink counters if the power is pulled without backup. Uplink counters can be caught-up when power is back. But the downlink frames will be rejected until the counter exceeds the previous value.

[Paul Fux]

Via ABP. I shutdown the device with the power switch… but by “device”, I mean, the lora sensor. The conduit AP still runs.

[Jason Reiss]

If the device is reset and counters are not saved then they will have to catch-up the counter to the previous value in the uplink.

[Paul Fux]

Ok. But why Lora server on Multitech AEP with firmware 1.3.2 allow to reset a lora device without counter check while Conduit AP with 1.4.4 firmware don’t ? Is the an option allowing that ?

[Jason Reiss]

LoRaWAN protocol does not allow reuse of frame counters. It is a security risk.

The AEP 1.4.4 firmware rejects them by default.

http://www.multitech.net/developer/forums/topic/disable-enablestrictcountervalidation/

[Paul Fux]

Thanks a lot for your help and answers.

[Paul Fux]

Hum. One more thing :

After a node-add and a join by the lora device, I restart my conduit AP and my lora device. Why the lora device cannot join anymore ?

CHECK-PKT|FCNT: ffffffff LAST-FCNT: 00000004 Duplicate: no
CHECK-MIC|ADDR: 00:00:36:ca failed
DROP-PKT|Addr: 00:00:36:ca Duplicate: no

I was expecting a reset of frames counter. It useful in a context where the Conduit and all the Lora sensors are prepare some days before being on production.

• This reply was modified 6 years, 3 months ago by Paul Fux.

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