tau-log 0.1.2

Binary log decoder for Tau project

tau-log

tau-log is a Python package that provides tools for reading and decoding binary log files, used in Tau project.

How to use it

Messages structure file creation

tau-log needs a json file with the minimum necessary information about all messages types in log file. An example of such file with only one message is given below:

{
  "TestMessage": {
    "index": 168,
    "data_field_names": [
      "time_ms",
      "pressure",
      "temperature",
      "altitude"
    ],
    "data_field_types": [
      "uint32",
      "float",
      "float",
      "double"
    ]
  }
}

In this example structure:

• TestMessage is a message unique name
• index is message unique id, which is 168 in this example. Index is always the first message field and always has uint8 type
• data_field_names contains names of all message fields. All names must be unique within one message
• data_field_types contains types of data in all message fields. This package currently supports only the following data types:
  • 4-byte signed integers: int, int32, long
  • 4-byte unsigned integers: uint32
  • 2-byte signed integers: int16
  • 2-byte unsigned integers: uint16
  • 1-byte signed integers: int8
  • 1-byte unsigned integers: uint8
  • 4-byte floating point numbers: float
  • 8-byte floating point numbers: double
  • 1-byte boolean numbers: bool

Log file decoding

Typical use of tau-log decoder:

import tau_log

log_decoder = tau_log.TauLogDecoder()
log_decoder.load_structure_from_json("structure.json")
log_decoder.decode_log("log_1.tau")

data = log_decoder.data

The decoder provides data in the form of a dictionary, where the data from each message is stored in a separate pandas DataFrame.