How to setup multicast transmission with Chirpstack

[be-mar]

Hi all, I want to establish multicast communication between chirpstack server and WIO-e5 mini modules.

Currently as a test base I'm using Lorawan-end-node. Unicast communication in class C works perfectly but seems like multicast messagess doesn't reach my debug module.

I've debugger connected to WIO-e5 development kit. Each time I try to send message from chirpstack using swagger API debugger doesn'y stop in defined breakpoint. I assume there is a problem with keys.

Could someone give me a guidence how to setup proper multicast communication? Thanks

[mingzhangqun]

Hello, I would like to confirm with you whether it is one node transmission to multiple chirpstacks? Did you correctly add nodes to each chirpstack? Can you provide your detailed configuration?

[be-mar]

Sorry for late reply. One chirpstack server - to two C class devices.

Not sure what you are asking about but here:

Gateway works as a packet forwarder:

Gateway is defined in chirpstack:

Unicast frames are visible here: Thing is that when I use api to post a multicast message the message itself is not visible in that log...

Device profile defined here:

Class C support enabled

Devices attached to application:

Mulitcast group with defined devices:

And gateway:

Config of multicast group:

Unicast messages from end device:

[mingzhangqun]

Make sure your module has multicast enabled. https://files.seeedstudio.com/products/317990687/res/LoRa-E5%20AT%20Command%20Specification_V1.0%20.pdf

[be-mar]

I tried to use this function for stock chip by typing at commands. Nothing happened. Then I decided to build lora-end-node project and manually define keys in se-identity.h but same. I can set breakpoints and see only unicast messages

[be-mar]

BTW. I use OTAA activation. Does it matter?

[mingzhangqun]

I tried to use this function for stock chip by typing at commands. Nothing happened. Then I decided to build lora-end-node project and manually define keys in se-identity.h but same. I can set breakpoints and see only unicast messages

Can you tell me all your detailed commands?

[be-mar]

1. AT
2. AT+ ID= DevEui, read and set in chiprstack server
3. AT+KEY=APPKEY, generated from chirpstack server
4. AT+ CLASS= C
5. AT+LW=MC,"ON", "00075126", "5c476f6789fb4e1f27e7af998f628d82","e64507a08270a7110343b8eeb69f4c6e" //values from screenshots
6. AT+ MODE= LWOTAA
7. AT+ JOIN

And later I can send unicast messages in both directions

[mingzhangqun]

Ok, thank you for your reply. I will analyze this problem next week.