Not receiving "up" packet on MQTT

[jostein89@gmail.com]

Hi.

My setup consists of one Multitech MTCDT-246A with fw 5.3.7.
It is setup as a “Network server” and “Local join server”.
I have added an “ELSYS ELT-2-HP” sensor under “Local End-Device Credentials” and I am receiving the following packets in MQTT from the GW:
join_request
packet_recv
joined
packet_sent

But I was expecting the “up” packet that contain decrypted data.
Any hint or tricks to point me in the right direction?

[Steve Kovarik]

Hi Jostein

I believe that the ‘up’ packet is decrypted but in a Base64 format.
Try converting the payload from Base64 format using a Base64 converter like one at the following link.
https://www.hcidata.info/base64.htm

[jostein89@gmail.com]

Hi.

Thanks for reply.
My problem is that I am not receiving the “up” packet. I am aware of the Base64 format in the data/payload field.

[Steve Kovarik]

Hi Jostein

Is the “Network server” configured for “Public LoRaWAN”?
Which regional “Channel Plan” is the “Network Server” and ELT-2 configured for.
How do you know the ELT-2 has sent an uplink packet?
What is the ELT-2 ‘data upload interval’ configured for?

LoRaWAN Troubleshooting guide.
http://www.multitech.net/developer/wp-content/uploads/downloads/2018/09/LoRaWANTroubleShootingGuide-09202018.pdf

[jostein89@gmail.com]

Hi.

The “NETWORK SERVER” is setup as “Private LoRaWAN”.
Both are configured for EU868, and have been communicating.

I am not familiar with the uplink packet, but I am basing my observations on the different MQTT topics:
lora/a8-17-58-ff-fe-03-cf-5b/join_request
lora/a8-17-58-ff-fe-03-cf-5b/packet_recv
lora/a8-17-58-ff-fe-03-cf-5b/joined
lora/a8-17-58-ff-fe-03-cf-5b/packet_sent

Ultimatly I am expecting the decrypted data published on MQTT-topic lora/a8-17-58-ff-fe-03-cf-5b/up in Base64. Sadly this topic is never published.

The upload interval on the ELT-2 is setup to 600 sec.

[Steve Kovarik]

Hi Jostein

I would recommend configuring the Network Server for “Public LoRaWAN” to be compatible with any other 3rd party LoRaWAN end-devices.
That will allow the Gateway to receive uplink packets using the default sync-word.

Private LoRaWAN uses a non-standard “sync-word” that would filter uplink packets using the default sync-word.

Introduction to LoRa

[jostein89@gmail.com]

Hi.

This seems to do the trick.

Thank you!

[Author]

Posts