Network-dat/Bluetooth-dat/BLE-SDK-dat/BLE-SDK-dat.md
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+
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+# BLE-SDK-dat
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+
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+## Which BLE Example to Use for Sending ADC Voltage to Phone
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+
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+Your goal:
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+- ESP32 reads ADC (battery voltage).
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+- Phone should receive/read the value over BLE.
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+
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+### Best Choices
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+- **Notify** ✅
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+ - ESP32 acts as a BLE server.
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+ - Sends **automatic notifications** with the ADC voltage.
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+ - Best if you want real-time updates on your phone.
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+
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+- **Server** ✅
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+ - ESP32 acts as a BLE server.
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+ - Phone connects and **reads the ADC value on demand**.
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+ - Good if you don’t need constant updates.
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+
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+- **UART** ✅
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+ - Implements a BLE serial-like service.
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+ - You can "print" ADC values and read them with a BLE UART app.
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+ - Easiest for testing/debugging, but less standard.
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+
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+### Not Suitable
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+- **Beacon / iBeacon / EddystoneTLM_Beacon / EddystoneURL_Beacon** ❌
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+ - These only broadcast fixed or simple data.
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+ - Not designed for continuous ADC updates.
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+
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+- **Scan / Beacon_Scanner / Client / Client_secure_static_passkey** ❌
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+ - These examples make ESP32 a **client/scanner**, not a server.
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+ - Your phone should be the client, so not useful here.
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+
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+- **BLE5_extended_scan / BLE5_multi_advertising / BLE5_periodic_advertising / BLE5_periodic_sync** ❌
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+ - Advanced BLE5 features (scanning, multi-adv, periodic sync).
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+ - Not needed for simple ADC-to-phone communication.
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+
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+- **Server_multiconnect / Server_secure_authorization / Server_secure_static_passkey** ❌
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+ - Variants of the Server example with multi-client or security features.
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+ - Only needed if you want multiple phones connected or secure pairing.
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Network-dat/Bluetooth-dat/BLE-dat/BLE-dat.md
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- [[nimBLE-dat]]
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+- [[ibeacon-dat]] - [[BLE5-dat]]
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+
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+
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Network-dat/Bluetooth-dat/iBeacon-dat/iBeacon-dat.md
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需要配置 iBeacon 模式，请发送 AT+ROLE3，再发 AT+RESET 重启
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- 第一步配置 iBeacon 的 UUID：AT+IBUUID 例子：AT+IBUUIDFDA50693A4E24FB1AFCFC6EB07647825
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- 第二步配置 iBeacon 的 MAJOR：AT+MAJOR0007
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-- 第一步配置 iBeacon 的 MINOR：AT+MINOR000A
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+- 第一步配置 iBeacon 的 MINOR：AT+MINOR000A
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+
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+
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+
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+## ESP32
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+
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+ #include <BLEDevice.h>
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+ #include <BLEServer.h>
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+ #include <BLEUtils.h>
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+ #include <BLE2902.h>
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+ #include <BLEBeacon.h>
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+
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+ #define DEVICE_NAME "ESP32"
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+ #define SERVICE_UUID "7A0247E7-8E88-409B-A959-AB5092DDB03E"
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+ #define BEACON_UUID "2D7A9F0C-E0E8-4CC9-A71B-A21DB2D034A1"
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+ #define BEACON_UUID_REV "A134D0B2-1DA2-1BA7-C94C-E8E00C9F7A2D"
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+ #define CHARACTERISTIC_UUID "82258BAA-DF72-47E8-99BC-B73D7ECD08A5"
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Network-dat/network-dat.md
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## Network tech by range
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-| Technology | Range | Data Rate | Notes |
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-|-----------------|-----------------------------|------------------|---------------------------------------------|
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-| [[M2M-dat]] | Almost infinite (provider) | Varies | Limited by service provider network |
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-| [[lora-dat]] | Long, up to 10 km | Low | |
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-| [[RF-link-dat]] | Medium, up to 1 km | Low | |
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-| [[ELRS-dat]] | Medium, up to 1 km (5 km) | High | |
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+| Technology | Range | Data Rate | Notes |
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+| --------------- | -------------------------- | --------- | ----------------------------------- |
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+| [[M2M-dat]] | Almost infinite (provider) | Varies | Limited by service provider network |
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+| [[lora-dat]] | Long, up to 10 km | Low | |
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+| [[RF-link-dat]] | Medium, up to 1 km | Low | |
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+| [[ELRS-dat]] | Medium, up to 1 km (5 km) | High | |
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- [[RTU-dat]] - [[modbus-dat]]
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+## info
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+### What is DTE and DCE?
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+
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+**DCE** = **Data Circuit-terminating Equipment** (also called Data Communications Equipment).
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+
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+- In the context of modems, the **DCE** is the modem itself.
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+- It connects to a **DTE** (**Data Terminal Equipment**), which is typically your computer, microcontroller, or router.
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+
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+**Roles:**
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+
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+| Device Type | Meaning | Example |
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+| ----------- | ------------------------------------------------------------------------------ | -------------------------------------- |
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+| **DTE** | Data Terminal Equipment — device that generates/uses data | PC, microcontroller, router |
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+| **DCE** | Data Circuit-terminating Equipment — device that provides a communication path | Modem, serial adapter, cellular module |
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+
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+
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+- The DTE and DCE sides determine **who provides clock signals**, and how cables are wired (TX/RX pins).
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+- In UART serial communication, for example:
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+ - DTE sends data to DCE, which modulates/transmits it.
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+ - DCE receives data from DTE, demodulates it, and sends it to the remote device.
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+
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+
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+
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+## What is PPP?
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+
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+**PPP** (**Point-to-Point Protocol**) is a data link layer protocol used to establish a **direct connection between two network nodes**.
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+It allows the transmission of **multi-protocol datagrams** (e.g., IP, IPv6, IPX) over serial links, phone lines, or other point-to-point connections.
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+
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+---
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+
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+### 2. Key Uses of PPP
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+- Connecting two devices over a serial link.
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+- Dial-up Internet access (historical).
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+- VPN connections (PPP over SSH or PPP over Ethernet).
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+- Cellular data connections (PPP over UART for modems).
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+
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+Example:
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+A microcontroller talking to a cellular modem (SIMCom, Quectel) over UART often uses PPP to establish an IP connection.
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SDK-dat/ESP-SDK-dat/ESP32-SDK-dat/ESP32-SDK-dat.md
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- [[partition-table-dat]]
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-- [[BLE-dat]]
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+- [[BLE-dat]] - [[network-dat]]
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- [[LVGL-dat]] - [[RTOS-dat]]
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- [[micropython-dat]] - [[circuitpython-dat]]
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+
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+# ESP32 Examples
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+
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+- **ArduinoOTA** → Update firmware over Wi-Fi (Over-The-Air).
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+- **BLE** → Use Bluetooth Low Energy (GATT server/client).
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+- **BluetoothSerial** → Classic Bluetooth SPP for serial communication.
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+- **DNSServer** → Implement a basic DNS server (e.g., captive portal).
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+- **EEPROM** → Read/write non-volatile storage like Arduino EEPROM.
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+- **ESP Insights** → Cloud monitoring/debugging for ESP devices.
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+- **ESP RainMaker** → IoT framework to connect ESP to cloud & apps.
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+- **ESP_I2S** → Use I2S peripheral for digital audio
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+- **ESP_NOW** → Low-power peer-to-peer wireless protocol by Espressif.
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+- **ESP_SR** → Speech recognition and audio processing examples.
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+- **ESP32** → General ESP32 hardware feature demos.
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+- **ESP32 Async UDP** → Non-blocking UDP networking example.
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+- **ESPmDNS** → Multicast DNS service (Bonjour/ZeroConf).
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+- **Ethernet** → Wired Ethernet networking examples.
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+- **FFat** → Flash FAT file system support on ESP32.
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+- **Firmata** → Protocol to control Arduino/ESP from PC software.
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+- **Hash** → Generate cryptographic hashes (SHA1, MD5, etc.).
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+- **HTTPClient** → Make HTTP requests from ESP32.
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+- **HTTPUpdate** → Update firmware via HTTP download.
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+- **HTTPUpdateServer** → Web server that allows OTA updates.
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+- **Keyboard** → Emulate USB keyboard (for ESP32-S2/S3).
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+- **LiquidCrystal** → Control HD44780-compatible LCDs.
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+- **LittleFS** → Flash-based file system alternative to SPIFFS.
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+- **Matter** → Smart home standard integration (formerly CHIP).
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+- **NetBIOS** → Windows NetBIOS name service support.
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+- **NetworkClientSecure** → Secure TLS client connections.
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+- **OpenThread** → Thread networking protocol (IPv6 mesh).
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+- **PPP** → Point-to-Point Protocol (e.g., cellular modems).
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+- **Preferences** → Non-volatile key/value storage API.
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+- **SD** → Access SD cards via SPI.
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+- **SD_MMC** → Access SD cards via SDIO/MMC interface.
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+- **Servo** → Control hobby servo motors.
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+- **SimpleBLE** → Simplified BLE server/client examples.
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+- **SPI** → Use SPI bus for peripherals.
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+- **SPIFFS** → Legacy flash file system (deprecated, use LittleFS).
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+- **Stepper** → Control stepper motors.
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+- **TFLite Micro** → Run TensorFlow Lite ML models on ESP32.
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+- **TFT** → Drive TFT LCD displays.
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+- **Ticker** → Timer-based periodic task execution.
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+- **Update** → Update firmware from local binary data.
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+- **USB** → USB host/device features (ESP32-S2/S3/C3).
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+- **WebServer** → Run a simple HTTP web server.
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+- **WiFi** → Connect to Wi-Fi and manage connections.
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+- **WiFiProv** → Provision Wi-Fi credentials via BLE/SoftAP.
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+- **Wire** → I²C communication with sensors/devices.
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+- **Zigbee** → Zigbee mesh networking protocol support.
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+
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+
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+
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## other reference
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- [Enabling ESP32 Secure Boot V2 (SBV2)](https://www.hackster.io/syncom/enabling-esp32-secure-boot-v2-sbv2-df32d5)