Remove UTF-8 BOM from TankAlarm-112025-Server-BluesOpta.ino

[Copilot]

Arduino CI compilation was failing on TankAlarm-112025-Server-BluesOpta.ino with stray byte errors (\357, \273, \277). The file contained a UTF-8 BOM header which the Arduino compiler rejects.

Changes:

• Removed UTF-8 BOM (bytes EF BB BF) from file start

The file now uses UTF-8 encoding without BOM, consistent with other .ino files in the repository and Arduino compiler requirements.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Arduino Compilation Error in TankAlarm-112025-Server-BluesOpta (2025-12-12)</issue_title>
<issue_description>## Arduino Compilation Failed

The Arduino code compilation failed in the CI workflow.

Workflow Run: https://github.com/SenaxInc/ArduinoSMSTankAlarm/actions/runs/20180274570
Commit: 1c2c6d3
Branch: master

Details

TankAlarm-092025 (MKR NB 1500)

• Client Sketch: TankAlarm-092025-Client-Hologram/TankAlarm-092025-Client-Hologram.ino ✅
• Server Sketch: TankAlarm-092025-Server-Hologram/TankAlarm-092025-Server-Hologram.ino ✅

TankAlarm-112025 (Arduino Opta)

• Client Sketch: TankAlarm-112025-Client-BluesOpta/TankAlarm-112025-Client-BluesOpta.ino ✅
• Server Sketch: TankAlarm-112025-Server-BluesOpta/TankAlarm-112025-Server-BluesOpta.ino ❌
• Viewer Sketch: TankAlarm-112025-Viewer-BluesOpta/TankAlarm-112025-Viewer-BluesOpta.ino ✅

Boards:

• Arduino MKR NB 1500 (arduino:samd:mkrnb1500)
• Arduino Opta (arduino:mbed_opta:opta)

Triggered by: push

Next Steps

1. Review the workflow logs for detailed error messages
2. Fix compilation errors in the Arduino code
3. Re-run the workflow to verify the fix

/cc @copilot</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Arduino Compilation Error in TankAlarm-112025-Server-BluesOpta (2025-12-12) #138

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[Copilot]

Pull request overview

This PR fixes an Arduino compilation failure by removing the UTF-8 Byte Order Mark (BOM) from the TankAlarm-112025-Server-BluesOpta sketch. The Arduino compiler was rejecting the file due to stray bytes (\357, \273, \277) which correspond to the UTF-8 BOM header (EF BB BF). The fix ensures the file uses UTF-8 encoding without BOM, consistent with Arduino compiler requirements and other .ino files in the repository.

Key Changes:

• Removed UTF-8 BOM (bytes EF BB BF) from the start of TankAlarm-112025-Server-BluesOpta.ino

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