TTN Smart Sensor (Nwave)

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function decodeUplink(input) { var data = {}; var bytes = input.bytes; var previousState; function calculatePreviousState(compressedDuration) { var result = {}; result.previous_state_duration_overflow = false; if (compressedDuration < 90) { result.previous_state_duration = compressedDuration; result.previous_state_duration_error = 0; } else if (compressedDuration >= 90 && compressedDuration < 120) { result.previous_state_duration = 90 + (compressedDuration - 90) * 5; result.previous_state_duration_error = 4; } else if (compressedDuration >= 120 && compressedDuration < 127) { result.previous_state_duration = 240 + (compressedDuration - 120) * 60; result.previous_state_duration_error = 59; } else if (compressedDuration === 127) { result.previous_state_duration = 660; result.previous_state_duration_error = null; result.previous_state_duration_overflow = true; } return result; } switch (input.fPort) { case 1: // Parking status data.type = "parking_status"; data.occupied = (bytes[0] & 0x1) === 0x1; previousState = calculatePreviousState((bytes[0] >> 1) & 0x7F); data.previous_state_duration = previousState.previous_state_duration; data.previous_state_duration_error = previousState.previous_state_duration_error; data.previous_state_duration_overflow = previousState.previous_state_duration_overflow; break; case 2: // Heartbeat const batteryHealthEnum = { low: 'low', normal: 'normal', critical: 'critical' } data.type = "heartbeat"; data.occupied = (bytes[0] & 0x1) === 0x1; data.hw_health_status = bytes[0] & 0x7F; var temp_byte = (bytes[2] > 127) ? bytes[2] - 256 : bytes[2] data.temperature = temp_byte / 2 + 10; var batteryVoltageMv = 2500 + bytes[1] * 4; data.battery_voltage = batteryVoltageMv / 1000; var criticalThreshold; var lowThreshold; if (data.temperature >= -5) { criticalThreshold = 2900; lowThreshold = 3000; } else if (data.temperature < -5) { criticalThreshold = 2800; lowThreshold = 2900; } if (batteryVoltageMv >= lowThreshold) { data.battery_health = batteryHealthEnum.normal; } else if (batteryVoltageMv >= criticalThreshold && batteryVoltageMv < lowThreshold) { data.battery_health = batteryHealthEnum.low; } else if (batteryVoltageMv < criticalThreshold) { data.battery_health = batteryHealthEnum.critical; } break; case 3: // Startup data.type = "startup"; data.firmware_version = bytes[0] + "." + bytes[1] + "." + bytes[2]; data.reset_cause = [ "rejoining_lorawan_network", "watchdog", "power_on", "user_request", undefined, undefined, "brownout", "other", ][bytes[3]]; data.occupied = (bytes[4] & 0x1) == 0x1; break; case 6: // Debug data.type = "debug"; data.bytes = bytes break; case 10: // SDI tag registration data.type = "user_registration"; if ((bytes[0] & 0x1) === 0x1) { data.occupied = true; previousState = calculatePreviousState((bytes[0] >> 1) & 0x7F); data.previous_state_duration = previousState.previous_state_duration; data.previous_state_duration_error = previousState.previous_state_duration_error; data.previous_state_duration_overflow = previousState.previous_state_duration_overflow; } else { data.occupied = null; data.previous_state_duration = null; data.previous_state_duration_error = null; data.previous_state_duration_overflow = null; } data.tag_id = (bytes[1] << 24 | bytes[2] << 16 | bytes[3] << 8 | bytes[4]).toString(16).toUpperCase(); break; } return { data: data, }; }