Phase 4: Connectivity

Connect ESP32 projects using Wi-Fi, HTTP, MQTT, WebSockets, Bluetooth, BLE, ESP-NOW, and OTA updates.

Learning objectives

• Select the appropriate ESP32 connectivity protocol.
• Build reliable local and networked services.
• Apply secure update and recovery practices to connected devices.

Recommended learning order

1. Wi-Fi Basics on ESP32 — Connecting to a Network (12 min)
2. ESP32 Wi-Fi Modes — Station, AP, and AP+STA (10 min)
3. ESP32 HTTP Client — GET and POST Requests (14 min)
4. ESP32 Web Server — Serve an HTML Control Page (16 min)
5. MQTT on ESP32 — Publish Sensor Data to a Broker (15 min)
6. WebSockets on ESP32 — Real-Time Bidirectional Communication (13 min)
7. Bluetooth Classic on ESP32 — Serial Over Bluetooth (SPP) (11 min)
8. BLE on ESP32 — GATT Server, Characteristics, and Notifications (14 min)
9. ESP-NOW — Low-Latency Peer-to-Peer Wireless Between ESP32 Boards (13 min)
10. OTA Updates on ESP32 — Update Firmware Over Wi-Fi (14 min)

Guide library

• Wi-Fi Basics on ESP32 — Connecting to a Network (12 min)
• ESP32 Wi-Fi Modes — Station, AP, and AP+STA (10 min)
• ESP32 HTTP Client — GET and POST Requests (14 min)
• ESP32 Web Server — Serve an HTML Control Page (16 min)
• MQTT on ESP32 — Publish Sensor Data to a Broker (15 min)
• WebSockets on ESP32 — Real-Time Bidirectional Communication (13 min)
• Bluetooth Classic on ESP32 — Serial Over Bluetooth (SPP) (11 min)
• BLE on ESP32 — GATT Server, Characteristics, and Notifications (14 min)
• ESP-NOW — Low-Latency Peer-to-Peer Wireless Between ESP32 Boards (13 min)
• OTA Updates on ESP32 — Update Firmware Over Wi-Fi (14 min)

Estimated completion time

Approximately 132 minutes of focused reading, plus hands-on practice.

Continue learning

• All ESP32 guides
• ESP32 projects
• Phase 1: ESP32 Fundamentals
• Phase 2: Setup & Development
• Phase 3: GPIO & Hardware

Frequently asked questions