Create LoRaWAN multicast group and send multicast downlink

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This guide will instruct you to create a LoRaWAN Multicast group and send Multicast downlink from LoRaWAN Server to a Multicast group.

  • Multicast downlinks are usually used to send remote configuration commands (sending interval, reboot, customed RS485 commands…) to a group of nodes.
  • Easy LoRaWAN Server: lorawan.easylorawan.com

What is LoRaWAN Multicast?

LoRaWAN Multicast group is a concept of grouping LoRaWAN nodes together to receive the same set of downlinks from server.

  • We can send a single downlink to the multicast address and all LoRaWAN nodes in the same multicast group will receive the downlink.
  • Multicast group will ease the downlink management and save the bandwidth of sending multiple downlinks to each of the LoRaWAN nodes.
  • All LoRaWAN nodes in the same multicast group share the same multicast-address, session-keys and frame-counter.
  • A LoRaWAN node can have up to 04 multicast groups.

broadcast multicast unicast

Steps

Step 1: To create a Multicast group in Easy LoRaWAN Cloud

  • To click to generate a random Multicast address, network session key and application session key. These address and keys will be used later to import to LoRaWAN nodes
  • To select the correct Region.
  • To select Class C. Class A is not supported and Class B is seldom used.

add multicast group

 Step 2: Make sure you select correct data-rate and Frequency.

  • They are from RX2 of your region.
  • This is IMPORTANT to key in the correct values.

data rate and frequency for multicast

Step 3: To add the LoRaWAN node / device to the Multicast group

  • You can add multiple nodes / devices to the multicast group.

add to multicast group

  • Select a multicast group to add the devices/nodes.

add to multicast group 2

Step 4: To configure LoRaWAN nodes to join multicast group at nodes

Step 5: To let LoRaWAN nodes to join and send uplink successfully.

Step 6: To send multicast downlink

send lorawan multicast downlink

Step 7: Your node should receive the multicast downlink as expected.

receive multicast downlink

Enjoy the power of LoRaWAN Multicast.

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Thanks for the great guide.
I finally make my LoRaWAN multicast working with my RAK3172.

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Yes, glad the guide is helpful for you.
You need to understand the flow to make it work.

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