This project aims to read simulated sensor data and write it to a log file.
This project requires a compiler supporting C++17 and uses CMake or Bazel for building. asio is used for network communication and json is used to encode to JSON. Google Test is used for testing.
It has been tested with GCC 7 and Clang 9 on Ubuntu 18.04 and GCC 9 and AppleClang 11 on macOS 10.15.
To build
oliver@canopus:~/repos/recorder$ git submodule update --init --recursive --recommend-shallow
oliver@canopus:~/repos/recorder$ cmake -S . -B build
oliver@canopus:~/repos/recorder$ cmake --build build
To run tests
oliver@canopus:~/repos/recorder$ cd build
oliver@canopus:~/repos/recorder/build$ GTEST_COLOR=1 ctest -V
To build all
oliver@canopus:~/repos/recorder$ bazel build //...
To build binaries and exclude tests
oliver@canopus:~/repos/recorder$ bazel build -- //... -//tests/...
To run tests
oliver@canopus:~/repos/recorder$ bazel test //...
User specified Bazel configuration settings will be loaded from user.bazelrc.
This file is ignored by Git.
Here's a simple usage example.
If building with bazel, binaries can be found in the bazel-bin directory.
Start the log server first
oliver@canopus:~/repos/recorder$ ./build/bin/logger 12345
Connect to the log server with a reader client
oliver@canopus:~/repos/recorder$ <sensor-simulator-bin> | ./build/bin/reader localhost 12345
The sensor data is piped to the reader client, which then forwards data to the remote log server.
The server accepts connections from multiple clients simultaneously. Status messages are also displayed when clients connect or disconnect.
Here's an example of logger output with two connections:
oliver@canopus:~/repos/recorder$ ./build/bin/logger 12345
Starting logger on port 12345
[127.0.0.1:56184] Established connection
{
"humidity": 80.80000305175781,
"name": "e74bb50f-5a1e-4742-8827-20bc80a17297",
"temperature": 3161.130126953125,
"timestamp": "2020-06-28T16:51:50.240+0200"
}
{
"humidity": 67.9000015258789,
"name": "e74bb50f-5a1e-4742-8827-20bc80a17297",
"temperature": 2731.8701171875,
"timestamp": "2020-06-28T16:51:54.732+0200"
}
{
"name": "e74bb50f-5a1e-4742-8827-20bc80a17297",
"timestamp": "2020-06-28T16:51:59.570+0200"
}
[127.0.0.1:56185] Established connection
{
"humidity": 17.799999237060547,
"name": "héllö",
"timestamp": "2020-06-28T16:52:04.006+0200"
}
{
"name": "e74bb50f-5a1e-4742-8827-20bc80a17297",
"temperature": 3479.840087890625,
"timestamp": "2020-06-28T16:52:03.403+0200"
}
{
"name": "héllö",
"temperature": 3440.93017578125,
"timestamp": "2020-06-28T16:52:05.613+0200"
}
{
"humidity": 85.9000015258789,
"name": "e74bb50f-5a1e-4742-8827-20bc80a17297",
"temperature": 2462.35009765625,
"timestamp": "2020-06-28T16:52:05.668+0200"
}
[127.0.0.1:56184] Terminating connection
{
"humidity": 5.5,
"name": "héllö",
"temperature": 732.1300048828125,
"timestamp": "2020-06-28T16:52:09.358+0200"
}
To log to a file, redirect the output of the logger:
oliver@canopus:~/repos/recorder$ ./build/bin/logger 12345 > sensor.log
Note that status messages are written to stderr.
The sensors transmit a timestamp without an associated timezone. The log process uses the machine local timezone.
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