Help Center/ IoT Device Access/ API Reference/ LwM2M API Reference on the Device Side/ Delivering a Command
Updated on 2023-02-16 GMT+08:00
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Delivering a Command

LwM2M Object Resource

The IoT platform delivers an asynchronous command to a device by packing the command into the payload of the LwM2M write message through the /19/1/0 resource object.

Operation

CoAP Method

URI

Success

Failure

Write

PUT

/19/1/0

2.04 Changed

4.00 Bad Request,

4.04 Not Found,

4.01 Unauthorized,

4.05 Method Not Allowed,

4.06 Not Acceptable

1. For devices connected using LwM2M, IoT platform supports only asynchronous command delivery.

2. After receiving the command, the IoT platform calls the codec you upload to the platform to encode the command and delivers the encoded command to the device. For details, see Developing a Codec.

Request Example

If the encoded value is c4 0d 5a 6e 96 0b c3 0e 2b 30 37, the delivery example is as follows:
CON-PUT    MID=48587, Token=2d82e7f54b, OptionSet={"Uri-Path":["19","1","0"], "Content-Format":"application/octet-stream"}, c4 0d 5a 6e 96 0b c3 0e 2b 30 37

Response Example

ACK-2.04   MID=48587, Token=2d82e7f54b, OptionSet={"Content-Format":"application/octet-stream"}, no payload