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Battery: channel 0x08, type 0x02 (analog), 2 bytes, multiplier 0.01V\n * - Humidity: channel 0x07, type 0x68, 1 byte, multiplier 0.5%\n * - Pressure: channel 0x06, type 0x73, 2 bytes, multiplier 0.1 hPa\n * - Temperature: channel 0x02, type 0x67, 2 bytes, multiplier 0.1°C signed\n * - Gas Resistance: channel 0x04, type 0x02 (analog), 2 bytes, multiplier 0.01 kΩ\n */\nexport function decodeRAK7204Payload(base64Data: string): DecodedRAK7204Payload {\n // Decode base64 to bytes\n const binaryString = atob(base64Data);\n const bytes = new Uint8Array(binaryString.length);\n for (let i = 0; i < binaryString.length; i++) {\n bytes[i] = binaryString.charCodeAt(i);\n }\n\n const result: DecodedRAK7204Payload = {\n batteryVoltage: 0,\n temperatureCelsius: 0,\n humidity: 0,\n };\n\n let i = 0;\n while (i < bytes.length - 2) {\n const channel = bytes[i];\n const type = bytes[i + 1];\n i += 2;\n\n switch (type) {\n case LPP_TYPES.ANALOG_INPUT: {\n // 2 bytes signed, multiplier depends on channel\n if (i + 2 > bytes.length) break;\n let value = (bytes[i] << 8) | bytes[i + 1];\n // Handle signed value\n if (value > 0x7fff) value -= 0x10000;\n\n if (channel === 0x08) {\n // Battery voltage: 0.01V multiplier\n result.batteryVoltage = value * 0.01;\n } else if (channel === 0x04) {\n // Gas resistance: 0.01 kΩ multiplier\n result.gasResistance = value * 0.01;\n }\n i += 2;\n break;\n }\n\n case LPP_TYPES.TEMPERATURE: {\n // 2 bytes signed, 0.1°C\n if (i + 2 > bytes.length) break;\n let value = (bytes[i] << 8) | bytes[i + 1];\n if (value > 0x7fff) value -= 0x10000;\n result.temperatureCelsius = value * 0.1;\n i += 2;\n break;\n }\n\n case LPP_TYPES.HUMIDITY: {\n // 1 byte unsigned, 0.5%\n if (i + 1 > bytes.length) break;\n result.humidity = bytes[i] * 0.5;\n i += 1;\n break;\n }\n\n case LPP_TYPES.BAROMETER: {\n // 2 bytes unsigned, 0.1 hPa\n if (i + 2 > bytes.length) break;\n const value = (bytes[i] << 8) | bytes[i + 1];\n result.pressure = value * 0.1;\n i += 2;\n break;\n }\n\n default:\n // Unknown type, try to skip (assume 2 bytes)\n i += 2;\n break;\n }\n }\n\n return result;\n}\n\n/**\n * Validate decoded payload values are within reasonable ranges\n */\nexport function validatePayload(decoded: DecodedRAK7204Payload): { valid: boolean; errors: string[] } {\n const errors: string[] = [];\n\n // Battery should be between 2.0V and 4.5V\n if (decoded.batteryVoltage < 2.0 || decoded.batteryVoltage > 4.5) {\n errors.push(`Battery voltage ${decoded.batteryVoltage}V outside expected range (2.0-4.5V)`);\n }\n\n // Temperature should be between -40°C and 85°C (BME680 operating range)\n if (decoded.temperatureCelsius < -40 || decoded.temperatureCelsius > 85) {\n errors.push(`Temperature ${decoded.temperatureCelsius}°C outside sensor range (-40 to 85°C)`);\n }\n\n // Humidity should be between 0% and 100%\n if (decoded.humidity < 0 || decoded.humidity > 100) {\n errors.push(`Humidity ${decoded.humidity}% outside valid range (0-100%)`);\n }\n\n return {\n valid: errors.length === 0,\n errors,\n };\n}\n","deleted","label",[171,172,153],"backend","services","permalink","https://www.val.town/x/jhiller/IncubatorTempHumidityTracker/code/backend/services/decoder.ts","extension","actionData","errors"]