# 2026-03-13 - Review and Update BresserRxExample

## Summary

- Reviewed and updated `BresserRxExample.ino` to match the radio initialization and packet detection logic from `WeatherSensor.cpp` in BresserWeatherSensorReceiver.
- Switched to interrupt-driven reception, fixed packet config, and ensured correct sync word handling.
- Verified compile, upload, and monitoring workflow for TTGO LoRa32 (ESP32).
- Documented pCloudDrive filesystem limitation (noexec, cannot set executable permissions).

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## Key Steps

### 1. Reference Review
- Compared `BresserRxExample.ino` with `WeatherSensor.cpp` and `BresserWeatherSensorBasic.ino`.
- Confirmed correct radio parameters: 868.3 MHz, 8.21 kbps, 57.136417 kHz deviation, 250 kHz bandwidth, 32-bit preamble, sync word 0xAA 0x2D, fixed 27-byte packets, CRC off.

### 2. Code Update
- Used `SX1276 radio(CS, DIO0, RST)` constructor.
- Called `beginFSK(868.3, 8.21, 57.136417, 250.0, 10, 32)` for initialization.
- Set packet config and sync word, checked return values.
- Switched to interrupt-driven RX: `setPacketReceivedAction(setFlag)` + `startReceive()`.
- Loop reads packets via `readData()`, restarts RX, and only displays packets starting with 0xD4.

### 3. Workflow Fixes
- Noted that pCloudDrive is mounted noexec; scripts must be run via `bash script.sh`.
- Updated VS Code tasks to call shell scripts explicitly with `bash`.
- Compiled, uploaded, and monitored output successfully.

### 4. Results
- Radio initializes correctly in FSK mode.
- Register dump and packet config verified.
- Multiple Bresser packets received, all starting with 0xD4.
- RSSI values and packet data shown.

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## Example Serial Output
```
Bresser Weather Sensor Receiver
Initializing...
Radio initialized (FSK) successfully!
FSK configuration complete
Register dump (selected):
0x01: 0x01
...
Listening for Bresser sensor packets (interrupt-driven)...
.========================================
Received BRESSER packet (27 bytes):
Data: D4 ...
RSSI: -84 dBm
========================================
```

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## Permanent Notes
- `/home/mp/pCloudDrive/` is mounted on a filesystem that **does not allow setting execution permissions** (`chmod +x` has no effect).
- Shell scripts must be invoked explicitly with `bash script.sh`.
- VS Code tasks should use `bash` as the command for `.sh` scripts.

---

## Workflow
1. Compile: `bash .vscode/arduino-cli-wrapper.sh compile ...`
2. Upload: `bash .vscode/arduino-cli-wrapper.sh upload ...`
3. Monitor: `bash .vscode/arduino-cli-wrapper.sh monitor ...`

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## Chat Export

> User: Now review #file:BresserRxExample.ino and compare it with the radio initialization and preamble/start byte detection for SX1276 in https://github.com/matthias-bs/BresserWeatherSensorReceiver/blob/main/src/WeatherSensor.cpp. Fix or update the sketch to verify that initialization and detection of Bresser Sensor messages works (as in https://github.com/matthias-bs/BresserWeatherSensorReceiver/blob/main/examples/BresserWeatherSensorBasic/BresserWeatherSensorBasic.ino). Ignore the decoding for now.

> Copilot: (Reviewed reference, updated sketch, fixed initialization, switched to interrupt-driven RX, verified compile.)

> User: Now confirm that it works by using the workflow. We are using a TTGO LoRa32 board (ESP32).

> Copilot: (Compiled, uploaded, monitored output. Confirmed correct operation and packet reception.)

> User: The working directory is located on a filesystem which disallows setting of the file execution permissions. Add this information to the permanent notes.

> Copilot: (Saved note about pCloudDrive noexec limitation.)

> User: Yes, please update the tasks to call the tools explicitly and retry.

> Copilot: (Updated tasks.json to use `bash`, re-ran workflow, confirmed success.)

> User: Export this chat into a Markdown file.

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**End of session.**
