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v2.6.0 - BME280 Diagnostics & Bug Fixes (2026-06-04)

What Changed?

This release adds BME280 sensor availability diagnostics to GET_STATUS and GET_BME280 responses. Users can now check whether the sensor was successfully initialized without inspecting boot-time serial output. It also fixes a field name inconsistency (temp_c → tmp_c) and several detection-related bugs.

What's New

Main Feature: BME280 Availability Flag

What it does: GET_STATUS and GET_BME280 responses now include an available field indicating whether the BME280 sensor was successfully initialized at boot.

How to use it: Send GET_STATUS or GET_BME280 via the serial monitor and check the available field:

{
  "type": "response",
  "status": "ok",
  "bme280": {
    "available": false,
    "tmp_c": 0.0,
    "atm_pa": 0.0,
    "hmd_pct": 0.0
  }
}

If available is false, the sensor was not detected at startup. Check I2C wiring (SDA=GPIO21, SCL=GPIO22) and I2C address (default: 0x76, alternative: 0x77).

Installation

Quick Start

# Get the release
git checkout 2.6.0

# Build
task v2:build

# Upload
task v2:upload

# Check it works
task monitor

What's Different from the Last Version?

Added

  • available field in GET_STATUS bme280 object
  • available field in GET_BME280 response
  • Task and Homebrew prerequisites in setup documentation (Raspberry Pi OS)

Fixed

  • Renamed temp_c to tmp_c in detection event output for consistency
  • Reset hit counters inside CosmicDetector::read() to make API self-contained
  • Added UL suffix to range constants in poll_count for consistency with threshold.cpp
  • Range-check val before uint16_t cast in threshold to prevent overflow bypass

Is It Safe to Upgrade?

Backward Compatible: Mostly yes

  • The available field is newly added — existing clients will ignore it
  • The rename from temp_c to tmp_c in detection events is a breaking change for clients parsing that field

Tests Passed

  • Builds without errors
  • GET_STATUS returns bme280.available
  • GET_BME280 returns available

Release Details

  • Date: 2026-06-04
  • Version: v2.6.0
  • Files Changed: 6