http://ocw.cs.pub.ro/courses/ 2026-05-02T02:58:47+03:00 http://ocw.cs.pub.ro/courses/ http://ocw.cs.pub.ro/courses/lib/tpl/arctic/images/favicon.ico text/html 2025-10-13T17:19:51+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab3_1?rev=1760365191&do=diff #include <Arduino.h> #include <WiFi.h> #include <PubSubClient.h> #ifndef WIFI_SSID #define WIFI_SSID "UPB-Guest" #endif #ifndef WIFI_PASSWORD #define WIFI_PASSWORD "" #endif #ifndef MQTT_HOST #define MQTT_HOST "test.mosquitto.org" #endif #ifndef MQTT_PORT #define MQTT_PORT 1883 #endif #ifndef BASE_TOPIC #define BASE_TOPIC "devices/esp32" #endif WiFiClient net; PubSubClient mqtt(net); // PubSubClient uses a separate setServer(...) unsigned long lastPub = 0; // … text/html 2025-10-11T13:18:54+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab3_2?rev=1760177934&do=diff #include <Arduino.h> #include <WiFi.h> #include <MQTT.h> // 256dpi MQTT library #include <ArduinoJson.h> #include <Adafruit_NeoPixel.h> //////////////// EDIT THESE //////////////// const char* WIFI_SSID = "YOUR_SSID"; const char* WIFI_PASSWORD = "YOUR_PASSWORD"; const char* MQTT_HOST = "test.mosquitto.org"; // or your lab broker const uint16_t MQTT_PORT = 1883; const char* BASE_TOPIC = "iot/studentname"; // change per student ///////////////////////////////////… text/html 2025-10-11T13:19:53+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab3_3?rev=1760177993&do=diff #include <Arduino.h> #include <WiFi.h> #include <Wire.h> #include <MQTT.h> #include <ArduinoJson.h> #include <Adafruit_BME680.h> //////////////// EDIT THESE //////////////// const char* WIFI_SSID = "YOUR_SSID"; const char* WIFI_PASSWORD = "YOUR_PASSWORD"; const char* MQTT_HOST = "test.mosquitto.org"; // or your lab broker const uint16_t MQTT_PORT = 1883; const char* BASE_TOPIC = "iot/studentname"; // change per student /////////////////////////////////////////… text/html 2025-10-11T13:20:45+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab3_4?rev=1760178045&do=diff #include <Arduino.h> #include <WiFi.h> #include <WiFiClientSecure.h> #include <MQTT.h> #include <Wire.h> #include <Adafruit_BME680.h> #include <Adafruit_NeoPixel.h> #include <ArduinoJson.h> //////////////// EDIT THESE //////////////// const char* WIFI_SSID = "YOUR_SSID"; const char* WIFI_PASSWORD = "YOUR_PASSWORD"; const char* MQTT_HOST = "test.mosquitto.org"; // or your lab broker const uint16_t MQTT_PORT = 1883; const char* BASE_TOPIC = "iot/studentname"; // change per s… text/html 2025-10-21T11:37:47+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab4_1?rev=1761035867&do=diff #include <Arduino.h> #include <WiFi.h> #include <WiFiUdp.h> #include <coap-simple.h> // hirotakaster/CoAP simple library // ===== Wi-Fi creds ===== const char* WIFI_SSID = "UPB-Guest"; const char* WIFI_PASS = ""; // ===== CoAP server (Californium demo) ===== const char* COAP_HOST = "californium.eclipseprojects.io"; const uint16_t COAP_PORT = 5683; // RFC 7252 default port // UDP + CoAP objects WiFiUDP udp; Coap coap(udp); // ----- Response callback: prints payload as text ----- void onCo… text/html 2025-10-21T16:59:17+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab4_2?rev=1761055157&do=diff #include <Arduino.h> #include <WiFi.h> #include <WiFiUdp.h> #include <Adafruit_NeoPixel.h> #include <coap-simple.h> // hirotakaster CoAP simple library // ===== Wi-Fi creds ===== const char* WIFI_SSID = "UPB-Guest"; const char* WIFI_PASS = ""; // ===== UDP + CoAP objects ===== WiFiUDP udp; Coap coap(udp, 256); // ===== On-board NeoPixel (GPIO 3) ===== constexpr uint8_t kNeoPixelPin = 3; constexpr uint8_t kNeoPixelCount = 1; constexpr uint8_t kNeoPixelBrightness = 128; // 50% to limit powe… text/html 2025-10-21T11:36:01+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab4_proxy?rev=1761035761&do=diff #!/usr/bin/env python3 """ Minimal HTTP ↔ CoAP proxy using aiohttp + a handcrafted UDP CoAP client. Expose REST-ish endpoints that translate browser-friendly HTTP requests to CoAP messages for the ESP32 server. Install dependencies: python3 -m pip install aiohttp Run (defaults shown): HTTP_PORT=8080 COAP_HOST=192.168.4.1 COAP_PORT=5683 python3 tools/http_coap_proxy.py Available endpoints: - GET /api/coap -> query params: host, port, method, path - POST /api/coap -> J… text/html 2025-10-22T10:00:48+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab5_1?rev=1761116448&do=diff // src/main.cpp #ifndef ZIGBEE_MODE_ED #error "Build flag -D ZIGBEE_MODE_ED missing" #endif #include <Arduino.h> #include <Wire.h> #include <Adafruit_BME680.h> #include <Adafruit_NeoPixel.h> #include <cmath> #include "Zigbee.h" // part of Arduino-ESP32 core Zigbee library constexpr uint8_t SDA_PIN = 21; constexpr uint8_t SCL_PIN = 22; constexpr uint8_t BOOT = 9; constexpr uint8_t NEOPIXEL_PIN = 3; constexpr uint8_t NEOPIXEL_COUNT = 1; constexpr uint8_t BME680_ADDRESS = 0x76; const… text/html 2025-10-22T11:34:01+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab5_2?rev=1761122041&do=diff // Sparrow Zigbee nodes: switch (end device) and light (router) #include <Arduino.h> #include "Zigbee.h" constexpr uint8_t SWITCH_PIN = 9; constexpr uint32_t FACTORY_RESET_HOLD_MS = 3000; constexpr uint32_t BUTTON_DEBOUNCE_MS = 50; #if defined(SPARROW_SWITCH) #include "ep/ZigbeeSwitch.h" constexpr uint8_t SWITCH_ENDPOINT = 1; ZigbeeSwitch switchEp(SWITCH_ENDPOINT); static bool lastButtonLevel = HIGH; static uint32_t lastButtonChangeMs = 0; static uint32_t pressStartMs = 0; static bool lon… text/html 2025-10-27T21:09:46+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab5_3?rev=1761592186&do=diff // Sparrow Zigbee nodes: switch (end device) and light (router) #include <Arduino.h> #include <esp_sleep.h> #include "driver/gpio.h" #include "Zigbee.h" constexpr uint8_t SWITCH_PIN = 9; constexpr uint32_t FACTORY_RESET_HOLD_MS = 3000; constexpr uint32_t BUTTON_DEBOUNCE_MS = 50; #if defined(SPARROW_SWITCH) #include "ep/ZigbeeSwitch.h" #include "zcl/esp_zigbee_zcl_command.h" #include "zcl/esp_zigbee_zcl_on_off.h" constexpr uint8_t SWITCH_ENDPOINT = 1; constexpr uint32_t COMMISSIONING_AWAK… text/html 2025-10-28T15:18:22+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_1?rev=1761657502&do=diff #pragma once #include <Arduino.h> #include <Wire.h> // Sparrow wiring / addresses #define LSM6DSL_I2C_ADDR 0x6A #define LSM6DSL_SDA_PIN 21 // GPIO21 on Sparrow #define LSM6DSL_SCL_PIN 22 // GPIO22 on Sparrow // LSM6DSL registers we care about #define LSM6DSL_CTRL1_XL 0x10 // accel config #define LSM6DSL_CTRL2_G 0x11 // gyro config #define LSM6DSL_CTRL3_C 0x12 // IF_INC, BDU, etc. #define LSM6DSL_OUTX_L_XL 0x28 // accel data start (X_L, X_H, Y_L, Y_H, Z_L, Z_H) // Sensitivit… text/html 2025-10-28T15:19:04+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_2?rev=1761657544&do=diff #include "LSM6DSL.h" bool LSM6DSL::begin() { Wire.begin(LSM6DSL_SDA_PIN, LSM6DSL_SCL_PIN); delay(50); // Enable accelerometer @208 Hz, ±2g, BW ~100 Hz: // CTRL1_XL (0x10): // ODR_XL[3:0]=0b0101 => 208 Hz // FS_XL[1:0]=00 => ±2g // BW_XL[1:0]=00 => ~100Hz // Combined: 0x50 if (!writeReg(LSM6DSL_CTRL1_XL, 0x50)) return false; // Turn gyro off for power saving: CTRL2_G = 0x00 (power-down) if (!writeReg(LSM6DSL_CTRL2_G, 0x00)) return false; … text/html 2025-10-28T15:20:48+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_3?rev=1761657648&do=diff #include <Arduino.h> #include "LSM6DSL.h" LSM6DSL imu; // Current label we’re streaming with each sample // 0 = idle, 1 = shake volatile uint8_t currentLabel = 0; // Timing const uint32_t SAMPLE_PERIOD_MS = 10; // ~100 Hz uint32_t lastSampleMs = 0; void handleSerialLabel() { while (Serial.available()) { char c = Serial.read(); if (c == 'i' || c == 'I') { currentLabel = 0; Serial.println("# label=IDLE(0)"); } else if (c == 's' || c == 'S') {… text/html 2025-10-28T15:24:09+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_4?rev=1761657849&do=diff #include <Arduino.h> #include <Adafruit_NeoPixel.h> #include <math.h> #include "LSM6DSL.h" #include "model.h" // generated by train_model.py LSM6DSL imu; // LED setup (NeoPixel on GPIO3, 1 pixel) #define NEOPIXEL_PIN 3 #define NEOPIXEL_COUNT 1 Adafruit_NeoPixel pixel(NEOPIXEL_COUNT, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800); // sampling const uint32_t SAMPLE_PERIOD_MS = 10; // ~100 Hz uint32_t lastSampleMs = 0; // ring buffer for accel magnitude static float magBuf[WINDOW_SIZE]; static uint16_… text/html 2025-10-28T15:59:36+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_5?rev=1761659976&do=diff import sys import time import serial import csv import argparse PORT = "/dev/cu.usbmodem2101" # <-- put your Sparrow port here BAUD = 115200 def parse_args(): p = argparse.ArgumentParser(description="Collect Sparrow IMU data with a fixed label.") g = p.add_mutually_exclusive_group(required=True) g.add_argument("-stationary", "--stationary", action="store_true", help="Use the 'stationary' label") g.add_argument("-shaking", "--shaking", action="store_true", … text/html 2025-10-28T17:52:49+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_6?rev=1761666769&do=diff import pandas as pd import numpy as np from sklearn.linear_model import LogisticRegression from sklearn.metrics import classification_report IDLE_CSV = "raw_data_label0.csv" SHAKE_CSV = "raw_data_label1.csv" WINDOW_SIZE = 50 # 0.5s window @ ~100 Hz STEP_SIZE = 25 # 50% overlap MODEL_HEADER_OUT = "include/model.h" def load_and_merge(): df0 = pd.read_csv(IDLE_CSV) df1 = pd.read_csv(SHAKE_CSV) # Just sanity: enforce int label for safety df0["label"] = 0 df1["label"] … text/html 2025-11-01T21:14:35+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_7?rev=1762024475&do=diff // main.cpp -- streaming wake-word validator with low-latency inference #include <Arduino.h> #include <ESP_I2S.h> #include <Adafruit_NeoPixel.h> #include <arduinoFFT.h> #include <math.h> #include "audio_model.h" #define AUTO_PICK_CHANNEL 1 #define FORCE_RIGHT_CHANNEL 1 // used if auto-pick disabled // Audio capture configuration ------------------------------------------------ constexpr int SAMPLE_RATE_HZ = 16000; constexpr int CLIP_SECONDS = 1; constexpr int CLIP_SAMPLES = SAMPLE_RATE_… text/html 2025-11-03T17:42:59+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab6_8?rev=1762184579&do=diff #include <Arduino.h> #include <ESP_I2S.h> // Sparrow mic pins (ICS-43434, I2S): // MIC_SCK -> GPIO18 (bit clock / bclk / sck) // MIC_WS -> GPIO20 (word select / ws / LRCLK) // MIC_SD -> GPIO19 (data from mic -> esp din) // // From Sparrow README pin table. (MIC_WS=GPIO20, MIC_SCK=GPIO18, MIC_SD=GPIO19) // // We'll set dout = -1 because Sparrow is only listening, not transmitting audio out. static I2SClass I2S; // recording config static const uint32_t SAMPLE_RATE_HZ = 16000; static const… text/html 2025-11-05T19:16:18+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab7_1?rev=1762362978&do=diff #include <Arduino.h> #include <Wire.h> #include <LSM6DSL.h> // dycodex/LSM6DSL-Arduino #include <Adafruit_NeoPixel.h> // for the on-board WS2812 // ===== Sparrow pinout (from board README) ===== // I2C: SDA=GPIO21, SCL=GPIO22 // LSM6DSL I2C address = 0x6A // NeoPixel on GPIO3 // (INT pin for LSM6DSL is GPIO11 if you later want interrupts) constexpr int PIN_SDA = 21; constexpr int PIN_SCL = 22; constexpr uint8_t LSM6DSL_ADDR = 0x6A; constexpr int NEOPIXEL_PIN = 3; constexpr int NEOPIXE… text/html 2025-11-05T19:38:51+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab7_2?rev=1762364331&do=diff #include <Arduino.h> #include <Adafruit_NeoPixel.h> #include "driver/i2s.h" #include <arduinoFFT.h> // ===== Sparrow audio pins (ICS-43434 I2S mic) ===== static const int I2S_WS_PIN = 20; // LRCLK / WS static const int I2S_SCK_PIN = 18; // BCLK static const int I2S_SD_PIN = 19; // DOUT from mic // ===== LED ===== static const int NEOPIXEL_PIN = 3; Adafruit_NeoPixel pixel(1, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800); // ===== Audio / DSP params ===== static const int SAMPLE_RATE = 16000; // … text/html 2025-11-06T18:26:32+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab7_3?rev=1762446392&do=diff // src/main.cpp // ESP32-C6 Sparrow: supports LTR303 or LTR308 digital light sensors // - Auto-detects which sensor is present // - LTR303: uses CH0 counts (robust brightness metric) // - LTR308: computes approximate lux using datasheet scaling // - Normalizes, runs online k-means, and maps to room-state labels // // PlatformIO deps (platformio.ini): // lib_deps = // adafruit/Adafruit LTR329 and LTR303@^3.0.1 // https://github.com/DFRobot/DFRobot_LTR308.git #include <Arduino.h> #include <Wi… text/html 2025-11-15T12:50:10+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab8_1?rev=1763203810&do=diff #include <Arduino.h> #include <WiFi.h> #include <HTTPClient.h> // ==== TODO: fill these in for the lab ==== const char* WIFI_SSID = "LAB_WIFI_SSID"; const char* WIFI_PASSWORD = "LAB_WIFI_PASSWORD"; const char* SERVER_URL = "http://192.168.1.100:8080/ingest"; // replace with your server IP // ========================================= const char* DEVICE_ID = "sparrow-01"; const char* API_KEY = "SUPER_SECRET_API_KEY_123"; // intentionally bad design void connectToWiFi() { S… text/html 2025-11-15T12:51:51+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab8_2?rev=1763203911&do=diff #include <Arduino.h> #include <WiFi.h> #include <WiFiClientSecure.h> #include <HTTPClient.h> // ====== LAB CONFIG: fill these in per-lab ====== const char* WIFI_SSID = "LAB_WIFI_SSID"; const char* WIFI_PASSWORD = "LAB_WIFI_PASSWORD"; // Replace with your server's IP const char* SERVER_URL = "https://192.168.1.100:8443/ingest"; const char* DEVICE_ID = "sparrow-01"; // This key must match SECRET_KEY on the server // NOTE: in real systems, putting secrets in firmware has risks → … text/html 2025-11-15T13:21:55+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab8_3?rev=1763205715&do=diff #include <Arduino.h> #include <WiFi.h> #include <WiFiClientSecure.h> #include <HTTPClient.h> #include <pgmspace.h> // ===================== LAB CONFIG ===================== // Wi-Fi credentials const char* WIFI_SSID = "LAB_WIFI_SSID"; const char* WIFI_PASSWORD = "LAB_WIFI_PASSWORD"; // Server hostname and port. // Hostname MUST match the CN/SAN in your server certificate (e.g. "iot-lab.local"). const char* SERVER_HOST = "iot-lab.local"; const uint16_t SERVER_PORT = 8443; // URL used by… text/html 2025-11-24T16:58:44+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab9_1?rev=1763996324&do=diff #include <WiFi.h> #include <WiFiClientSecure.h> #include <HTTPClient.h> #include <Adafruit_BME680.h> #include <Adafruit_NeoPixel.h> #include <ArduinoJson.h> // ====== USER CONFIG ====== const char* WIFI_SSID = "YOUR_WIFI_SSID"; const char* WIFI_PASSWORD = "YOUR_WIFI_PASSWORD"; const char* FIREBASE_API_KEY = "YOUR_FIREBASE_API_KEY"; // from firebaseConfig.apiKey const char* FIREBASE_DB_URL = "https://YOUR_PROJECT_ID-default-rtdb.YOUR_REGION.firebasedatabase.app"; const char* DEVICE_EMAIL… text/html 2025-11-23T12:52:50+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab9_2?rev=1763895170&do=diff <!doctype html> <html lang="en"> <head> <meta charset="utf-8" /> <title>Sparrow Dashboard</title> <meta name="viewport" content="width=device-width, initial-scale=1" /> <style> body { font-family: system-ui, sans-serif; margin: 0; padding: 0; background: #111; color: #eee; } .container { max-width: 900px; margin: 0 auto; padding: 1.5rem; } h1, h2 { font-weight: 600; } .card { background: #1c1c1c; border-radius: 1rem; padding: 1rem 1.25rem; margin-… text/html 2025-11-23T12:53:24+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab9_3?rev=1763895204&do=diff // ===== Firebase config (from Firebase console web app) ===== const firebaseConfig = { apiKey: "YOUR_API_KEY", authDomain: "your-project-id.firebaseapp.com", databaseURL: "https://your-project-id-default-rtdb.YOUR_REGION.firebasedatabase.app", projectId: "your-project-id", }; const DEVICE_ID = "sparrow-01"; const MAX_CHART_POINTS = 50; const CHART_LOCAL_SRC = "chart.umd.min.js?v=1"; const CHART_CDN_SRC = "https://cdn.jsdelivr.net/npm/chart.js@4.4.3/dist/chart.umd.min.js"; // Wait fo… text/html 2025-11-23T12:56:45+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab9_4?rev=1763895405&do=diff /** * Skipped minification because the original files appears to be already minified. * Original file: /npm/chart.js@4.4.3/dist/chart.umd.js * * Do NOT use SRI with dynamically generated files! More information: https://www.jsdelivr.com/using-sri-with-dynamic-files */ /*! * Chart.js v4.4.3 * https://www.chartjs.org * (c) 2024 Chart.js Contributors * Released under the MIT License */ !function(t,e){"object"==typeof exports&&"undefined"!=typeof module?module.exports=e():"function"==typeo… text/html 2025-12-06T18:41:53+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab10_1?rev=1765039313&do=diff #include <Arduino.h> #include <WiFi.h> #include <AsyncTCP.h> #include <ESPAsyncWebServer.h> #include <ElegantOTA.h> const char* ssid = "UPB-Guest"; const char* password = ""; // OTA basic auth (recommended) const char* ota_user = "admin"; const char* ota_pass = "change-me"; AsyncWebServer server(80); void setup() { Serial.begin(115200); delay(200); WiFi.mode(WIFI_STA); WiFi.begin(ssid, password); Serial.print("Connecting to WiFi"); while (WiFi.status() != WL_CONNECTED) { … text/html 2025-12-06T18:51:01+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab10_2?rev=1765039861&do=diff #include <Arduino.h> #include <WiFi.h> #include <AsyncTCP.h> #include <ESPAsyncWebServer.h> #include <ElegantOTA.h> #include <Adafruit_NeoPixel.h> const char* ssid = "UPB-Guest"; const char* password = ""; // OTA basic auth (recommended) const char* ota_user = "admin"; const char* ota_pass = "change-me"; constexpr uint8_t NEOPIXEL_PIN = 3; constexpr uint16_t NEOPIXEL_COUNT = 1; Adafruit_NeoPixel statusPixel(NEOPIXEL_COUNT, NEOPIXEL_PIN, NEO_GRB + NEO_KHZ800); AsyncWebServer server(80); v… text/html 2025-12-06T21:23:12+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab10_3?rev=1765048992&do=diff #include <Arduino.h> #include <WiFi.h> #include <AsyncTCP.h> #include <ESPAsyncWebServer.h> #include <Adafruit_NeoPixel.h> #include <HTTPClient.h> #include <Update.h> #include <ArduinoJson.h> #include <Preferences.h> #include "mbedtls/sha256.h" const char* ssid = "UPB-Guest"; const char* password = ""; // Pull-OTA settings (host these on your local machine) const char* fw_version = "1.0.0"; const char* ota_manifest_url = "http://192.168.0.104:8000/manifest.json"; // adjust to your LA… text/html 2025-12-15T16:58:03+03:00 http://ocw.cs.pub.ro/courses/iothings/laboratoare/2025_code/lab11_1?rev=1765810683&do=diff #!/usr/bin/env python3 """ Sparrow Serial Watcher (macOS, ESP32-C6 native USB) - v6 What this solves: - ESP32-C6 native USB Serial/JTAG on macOS often disconnects and re-enumerates on reset. - After a hard reset, console output may resume only after a host "touch". - west espressif monitor (idf_monitor) appears to do a helpful open/reset/line-state dance. - This script emulates a safe subset of that behavior. Key behaviors: - Only considers /dev/*usbmodem* ports by default (macOS-safe). - Avoi…