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.

[be-mar]

Have you had an opportunity to check this issue?

[mingzhangqun]

AT+ CLASS=C must run after AT+join. Can you give it a try and let me know?
Thank you.

btw, which version of chirpstack do you use?

[mingzhangqun]

I've tried on two devices E5 nodes COM77 and COM78.
COM77
» AT+ID
« +ID: DevAddr, 01:56:81:C9
+ID: DevEui, 2C:F7:F1:20:24:40:00:EA
+ID: AppEui, 80:00:00:00:00:00:00:06
AT+MODE=LWOTAA
AT+DR=EU868
AT+ID=DevAddr,"015681c9"
AT+KEY=APPKEY,"a98dd0ae84f9778f7720ca844785b04e"
AT+KEY=NWKSKEY,"650b74915ead6846345de75508fb5b50"
AT+KEY=APPSKEY,"7bb1d5c7fc950a66c3c8576129ddef12"
AT+LW=MC,ON,"019510a0","850f4525bb585e6ed9afa2fa72dc63d0","e28737a5ac72d22dce22c0b299db2073",0
AT+JOIN
AT+CLASS=C

COM78
» AT+ID
« +ID: DevAddr, 01:1E:96:A0
+ID: DevEui, 2C:F7:F1:20:32:30:C4:9B
+ID: AppEui, 80:00:00:00:00:00:00:06
AT+MODE=LWOTAA
AT+DR=EU868
AT+ID=DevAddr,"011e96a0"
AT+KEY=APPKEY,"2b691f7af4c6f332c98e144085f8607d"
AT+KEY=NWKSKEY,"64726033f21b8369b4fc3508ca9b2b40"
AT+KEY=APPSKEY,"3f330c7777a917f26e6bee74f8a20a2a"
AT+LW=MC,ON,"019510a0","850f4525bb585e6ed9afa2fa72dc63d0","e28737a5ac72d22dce22c0b299db2073",0
AT+JOIN
AT+CLASS=C

[be-mar]

AD 2513928451
I tested it previously on Chirpstack v3 and v4 with the same results. I'll try that order of commands.

Where can I find these values?
AT+KEY=APPKEY,"a98dd0ae84f9778f7720ca844785b04e"
AT+KEY=NWKSKEY,"650b74915ead6846345de75508fb5b50"
AT+KEY=APPSKEY,"7bb1d5c7fc950a66c3c8576129ddef12"

[be-mar]

Update. Tested with AT commands and works! But as you can see I didn't specify AT+KEY=APPKEY, AT+KEY=NWKSKEY, AT+KEY=APPSKEY.

Have to verify if will that work with lora-end-node project. Could you give me some tips what needs to be modified there to enable multicast messages?

[mingzhangqun]

It's great.
These keys are randomly generated.

Currently the lora-end-node project is not verified with multicast.
You can reference this repo:
https://github.com/SylvainMontagny/STM32WL

Thank you.

[be-mar]

These keys are randomly generated. So should I skip this step or generate this keys and somhow store them in server. Sorry, I don't get it 🤔

[mingzhangqun]

Save both in server and e5-node.

[be-mar]

I'm closing this issue as it is working with at commands. Thanks

[be-mar]

@mingzhangqun one side question. How did you set chirpstack to see that Queue tab in MC group?

It's apparently missing from my server..

[mingzhangqun]

@be-mar There may be differences between versions, please try v4.10.1.
Thank you.

[be-mar]

Yep, I had v4.9. After upgrade to 4.11 I can see this tab. Thx