pynimcodec
A set of message codecs for use with satellite IoT products implemented in Python.
Compact Binary Codec (CBC)
A Python implementation of Viasat CBC
nimo
The NIMO message codec was designed by ORBCOMM and represents an efficient binary data packing for various data types at a bit-level.
This module also provides facilities to build a XML file compliant with the ORBCOMM and/or Viasat Message Definition File concept to apply to messages sent over the IsatData Pro service.
The principles of the NIMO Common Message Format are:
- First byte of payload is Service Identification Number (SIN)
representing a microservice running on an IoT device.
Each
<Service>consists of<ForwardMessages>(e.g. commands) and/or<ReturnMessages>(e.g. reports or responses from the IoT device). SIN must be in a range 16..255.
[!WARNING] SIN range 16..127 may conflict with certain ORBCOMM-reserved messages when using the ORBCOMM IDP service.
-
Second byte of payload is Message Identification Number (MIN) representing a remote operation such as a data report or a command. The combination of SIN and MIN and direction (Forward/Return) enables decoding of subsequent
<Fields>containing data. -
Subsequent bytes of data are defined by
<Fields>where each<Field>has a data type such as<SignedIntField>,<EnumField>, etc. These fields can be defined on individual bitwise boundaries, for example a 5-bit unsigned integer with maximum value 31, or a boolean single bit.
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