Class C end devices continuously listen for downlink messages. This allows applications to send messages to devices at any time, instead of having to wait for a Class A uplink. When combined with multicast groups, this allows applications to send immediate downlinks to many devices at the same time.
This guide shows how to enable or disable Class C for an and device, and how to work with multicast groups.
The Things Stack keeps a queue of downlink messages per device. Applications can keep pushing downlink messages or replace the queue with a list of downlink messages.
You can schedule downlink using the CLI, MQTT or HTTP webhooks.
This guide shows how to interact with the downlink queue from the command-line interface (CLI).
The Things Stack can generate QR codes for your devices. This helps identifying the devices and allows for claiming the device.
This guide shows you to generate a QR code for claiming with the command-line interface (CLI).