urn
stands for unique resource name.dev
means we are identifying a device.DEVEUI
is the type of device identifier used to identify the device.01234567890ABCDEF
is the DevEUI, the device identifier.urn:dev:IMEI:0123456789012345:
.:
!The (..) name MUST consist only of characters out of the set "A" to "Z", "a" to "z", and "0" to "9", as well as "-", ":", ".", "/", and "_"; furthermore, it MUST start with a character out of the set "A" to "Z", "a" to "z", or "0" to "9". - The SenML spec, RFC8428 section 4.5.1
u
-values in camel case, so start with a lower case character."bt": 1600185600
(2020-09-15T16:00:00+00:00) and the pack contains a measurement with "t": -60
.true
or false
.