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644	644	== 9.2  Example to configure chirpstack Multicast ==
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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.
	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.
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649	649	[[image:image-20240923105725-1.png]]
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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:
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	652	+This example assumes users already have:
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	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	+
654	654	=== Step 1. Create the multicast group ===
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	670	+Create the multicast group on the corresponding **Application~-~->multicast groups~-~->Add multicast-group** interface, For example, multicast_test01_au915
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	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	+
658	658	= 9.  Multiply Uplink in ChirpStack =
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