This Python script runs on a Raspberry Pi (or any Linux system) and:

1. Reads incoming text data from a serial port (e.g. a USB-connected device such as a pager, sensor, or microcontroller).
2. Detects when the incoming data changes.
3. Saves each unique line to a local CSV log file.
4. Sends each unique line as an HTTP POST request to a remote web server for further processing.

• ✅ Works with /dev/serial/by-id/... or /dev/ttyUSB0
• ✅ Filters out duplicate lines (only sends new data)
• ✅ Logs timestamped entries to test_data.csv
• ✅ Sends data to a remote PHP/HTTP endpoint via requests.post()
• ✅ Handles serial decoding issues gracefully
• ✅ Recovers from most runtime errors without crashing

• Python 3.x
• Installed Python packages:

  pip install pyserial requests