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644 644  == 9.2  Example to configure chirpstack Multicast ==
645 645  
646 646  
647 -This section illustrates how to configure ChirpStack Multicast. Below is the network structure, we use our LPS8v2 as the LoRaWAN gateway and two SN50v3-LB as the LoRaWAN end-node here.
647 +This section illustrates how to configure ChirpStack Multicast. Below is the network structure, we use our LPS8v2 as the LoRaWAN gateway and SN50v3-LB as the LoRaWAN end-node here.
648 648  
649 649  [[image:image-20240923105725-1.png]]
650 650  
651 +The LPS8V2 is already set to connect to Chirpstack. So what we need to do now is only configure register these devices to Chirpstack:
651 651  
652 -This example assumes users already have:
653 653  
654 -* SN50v3-LB register on ChirpStack server already
655 -* The user is able to see the data on the ChirpStack server device page.
656 -
657 -(% class="wikigeneratedid" %)
658 -(% style="color:red" %)**Note: **(%%)SN50v3-LB must enable CLASS C and DISFCNTCHECK(The downlink fcnt is not compared with the fcnt of the node).
659 -
660 -(% class="wikigeneratedid" %)
661 -AT command: **AT+CLASS=C**
662 -
663 -(% class="wikigeneratedid" %)
664 - **AT+DISFCNTCHECK=1**
665 -
666 -
667 667  === Step 1. Create the multicast group ===
668 668  
669 669  
670 -Create the multicast group on the corresponding **Application~-~->multicast groups~-~->Add multicast-group** interface, For example, multicast_test01_au915
671 671  
672 -[[image:image-20240923141847-3.png||height="620" width="1207"]]
673 -
674 -
675 -Enter the Multicast address,Multicast network session key,Multicast application session key.
676 -
677 -Use the default LoRaWAN settings, as below:
678 -
679 -* EU868: 869525000hz, DR0
680 -
681 -* US915: 923300000hz, DR8
682 -
683 -* CN470: 505300000hz, DR0
684 -
685 -* AU915: 923300000hz, DR8
686 -
687 -* AS923: 923200000hz, DR2
688 -
689 -* KR920: 921900000hz, DR0
690 -
691 -* IN865: 866550000hz, DR2
692 -
693 -* RU864: 869100000hz, DR0
694 -
695 -Group type: **Class-C**
696 -
697 -Class-C scheduling type : **Delay**
698 -
699 -[[image:image-20240923142446-5.png||height="720" width="1208"]]
700 -
701 -
702 -=== Step 2. Add gateways and devices to the multicast group ===
703 -
704 -
705 -Select a gateway on the "**Gateways**" screen, click "**selected gateways"**, and click "**Add to multicast-group**" to add the gateway to the corresponding multicast group, for example, **multicast_test01_au915**.
706 -
707 -[[image:image-20240923144335-6.png||height="619" width="1209"]]
708 -
709 -[[image:image-20240923144418-7.png||height="572" width="1206"]]
710 -
711 -
712 -On the **Application->Devices** interface, select two SN50v3-LB nodes registered with multicast support, and then click "**Selected devices**". and click "**Add to multicast-group**" to add the node to the corresponding multicast group
713 -
714 -[[image:image-20240923144744-8.png]][[image:image-20240923144749-9.png||height="623" width="1211"]]
715 -
716 -
717 -Access the multicast group to check whether two SN50V3-LBs and gateways are added successfully
718 -
719 -[[image:image-20240923145148-10.png||height="601" width="1218"]]
720 -
721 -
722 -=== Step 3. Use the API for multicast Downlink ===
723 -
724 -
725 -To use API Downlink, user first need to generate an API key
726 -
727 -[[image:image-20240923145624-18.png||height="429" width="1211"]]
728 -
729 -[[image:image-20240923145506-12.png]][[image:image-20240923145520-16.png||height="422" width="1212"]]
730 -
731 -
732 -For example:**[[https:~~/~~/www.chirpstack.io/docs/chirpstack/api/index.html>>url:https://www.chirpstack.io/docs/chirpstack/api/index.html]]**
733 -
734 -[[image:image-20240923145945-19.png]][[image:image-20240923145953-21.png||height="808" width="1222"]][[image:image-20240923145949-20.png]]
735 -
736 -
737 -Users can access the Linux console of the gateway via SSH, and then use the curl command to multicast Downlink
738 -
739 -The format is as follows:
740 -
741 -(% class="box infomessage" %)
742 -(((
743 -curl -X POST 'http:~/~/**Chirpstack_Server_Address**:8090/api/multicast-groups/**Multicast_Groups_ID**/queue' -H "Content-Type: application/json" -H "Authorization: Bearer **eyJ0eXAiOiJKV1QiLCJhbGciOiJIUzI1NiJ9.eyJhdWQiOiJjaGlycHN0YWNrIiwiaXNzIjoiY2hpcnBzdGFjayIsInN1YiI6IjM3YmRiNzBjLTNjODgtNDFjMi04YmQ2LTgyMDI4ZjdkNzY3NyIsInR5cCI6ImtleSJ9.p1xvRP1PAdwLnLAJn9w6ef612KM8oPZSa_2v4UYPV0w**" -d '{
744 - "queueItem": {
745 - "data": "EjRWeA==",
746 - "fCnt": 0,
747 - "fPort": 123
748 - }
749 -}'
750 -)))
751 -
752 -In the command,eyJ........._2v4UYPV0w is the API key, which can be obtained from the Chirpstack server and the data format is base64,
753 -
754 -
755 -=== Result ===
756 -
757 -Connecting to the SN50v3-LB using the serial USB-TTL port can check that two SN50v3-LBs are receiving Downlink at the same time
758 -
759 -[[image:image-20240923151814-23.png||height="563" width="1255"]]
760 -
761 -
762 762  = 9.  Multiply Uplink in ChirpStack =
763 763  
764 764  
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