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If the command cannot be delivered to the device, this method returns an error; in particular, if the device is not subscribed, this method returns FAILED_PRECONDITION. Otherwise, this method returns OK. If the subscription is QoS 1, at least one delivery will be guaranteed; for QoS 0, no acknowledgment is expected from the device.


Note: This is a regional API.

You can find the URL, SystemKey, and token required in the call by clicking API Keys (key icon) at the top-right of the Registry Details page. Use the Registry Keys section.