port: support ESP32 v3.x

.github/workflows/build.yml

@@ -15,7 +15,6 @@ jobs:
             fqbn: esp8266:esp8266:nodemcuv2
           - chip: ESP32
             core-url: https://espressif.github.io/arduino-esp32/package_esp32_index.json
-            core-version: '@2.0.17'
             fqbn: esp32:esp32:esp32wrover
             build-args: --build-property=build.partitions=default_ffat
             arduino-libs: NimBLE-Arduino
@@ -26,7 +25,6 @@ jobs:
             build-args: --build-property=build.partitions=default_ffat
           - chip: ESP32C3
             core-url: https://espressif.github.io/arduino-esp32/package_esp32_index.json
-            core-version: '@2.0.17'
             fqbn: esp32:esp32:esp32c3
             build-args: --build-property=build.partitions=default_ffat
             arduino-libs: NimBLE-Arduino

README.md

@@ -4,8 +4,6 @@
 
 **esp8266ndn** library enables [Named Data Networking](https://named-data.net/) application development in Arduino environment. It supports [ESP8266](https://github.com/esp8266/Arduino), [ESP32, ESP32-S2, ESP32-C3](https://github.com/espressif/arduino-esp32), and [Adafruit nRF52](https://github.com/adafruit/Adafruit_nRF52_Arduino) microcontrollers.
 
-Note: currently NDNph and esp8266ndn are compatible with ESP32 Arduino core v2.x; it is incompatible with ESP32 Arduino core v3.x at the moment.
-
 * [Doxygen documentation](https://esp8266ndn.ndn.today/)
 * [#esp8266ndn on Twitter](https://twitter.com/hashtag/esp8266ndn) for announcements
 * [GitHub Issues](https://github.com/yoursunny/esp8266ndn) for bug reports and best-effort support

src/port/random.cpp

@@ -3,7 +3,7 @@
 #if defined(ARDUINO_ARCH_ESP8266)
 #include <Arduino.h>
 #elif defined(ARDUINO_ARCH_ESP32)
-#include <esp_system.h>
+#include <esp_random.h>
 #elif defined(ARDUINO_ARCH_NRF52)
 #include <Arduino.h>
 #include <algorithm>

src/transport/ble-server-transport.hpp

@@ -69,7 +69,7 @@ class BleServerTransport : public BleServerTransportBase {
 
   /** @brief Retrieve BLE address and address type. */
   String getAddr() const {
-    return String(::BLEDevice::getAddress().toString().data()) + " (addr-type=public)";
+    return String(::BLEDevice::getAddress().toString().c_str()) + " (addr-type=public)";
   }
 
 private:
@@ -102,8 +102,8 @@ class BleServerTransport : public BleServerTransportBase {
       if (chr != m_transport.m_cs) {
         return;
       }
-      std::string value = chr->getValue();
-      m_transport.handleReceive(reinterpret_cast<const uint8_t*>(value.data()), value.size(), 0);
+      auto value = chr->getValue();
+      m_transport.handleReceive(reinterpret_cast<const uint8_t*>(value.c_str()), value.length(), 0);
     }
 
   private: