Skip to main content

FIWARE IoTAgent Ultralight 2.0 Protocol

Ultralight 2.0 is a lightweight text based protocol aimed to constrained devices and communications where the bandwidth and device memory may be limited resources.

It is used by FIWAREs IotAgent-UL.

Implementation​

The source code of the format-type is available here: https://github.com/VILLASframework/node/blob/master/lib/formats/iotagent_ul.cpp

Configuration​

The iotagent_ul format-type supports the following settings:

delimiter
string
real_precision
integer
Default: 17

Output all real numbers with at most n digits of precision. The valid range for this setting is between 0 and 31 (inclusive), and other values result in an undefined behavior.

By default, the precision is 17, to correctly and losslessly encode all IEEE 754 double precision floating point numbers.

ts_origin
boolean
Default: true

If set, include the origin timestamp in the output.

ts_received
boolean
Default: true

If set, include the received timestamp in the output.

sequence
boolean
Default: true

If set, include the sequence number in the output.

data
boolean
Default: true

If set, include the data in the output.

offset
boolean
Default: true

If set, include the offset between origin and received timestamp in the output.

{
  • "delimiter": "string",
  • "real_precision": 17,
  • "ts_origin": true,
  • "ts_received": true,
  • "sequence": true,
  • "data": true,
  • "offset": true
}

Example Configuration​

node/etc/examples/formats/iotagent_ul.conf
nodes = {
    node = {
        type = "file"
        uri = "/dev/null"

        format = "iotagent_ul"
    }
}

Further Documentation​