Allow definition of custom network interfaces

src/NetworkClient.h

@@ -0,0 +1,34 @@
+#pragma once
+
+#include <Client.h>
+#include <WiFiClient.h>
+
+class NetworkClient : public Client {
+    class Impl;
+    std::unique_ptr<Impl> _impl;
+
+  public:
+    NetworkClient();
+    NetworkClient(WiFiClient wifi_client);
+    virtual ~NetworkClient();
+
+    int connect(IPAddress ip, uint16_t port) final;
+    int connect(const char * host, uint16_t port) final;
+    int connect(const char * host, uint16_t port, int32_t timeout);
+    size_t write(uint8_t) final;
+    size_t write(const uint8_t * buf, size_t size) final;
+    size_t write(const char * str);
+    int available() final;
+    int read() final;
+    int read(uint8_t * buf, size_t size) final;
+    int peek() final;
+    void flush() final;
+    void stop() final;
+    uint8_t connected() final;
+    operator bool() final;
+
+    void setCACert(const char * rootCA);
+    void setCACertBundle(const uint8_t * bundle);
+    void setInsecure();
+    bool verify(const char * fingerprint, const char * domain_name);
+};

src/WebSockets.h

@@ -135,6 +135,7 @@
 #define NETWORK_UNOWIFIR4 (7)
 #define NETWORK_WIFI_NINA (8)
 #define NETWORK_SAMD_SEED (9)
+#define NETWORK_CUSTOM (10)
 
 // max size of the WS Message Header
 #define WEBSOCKETS_MAX_HEADER_SIZE (14)
@@ -286,6 +287,14 @@
 #define WEBSOCKETS_NETWORK_CLASS WiFiClient
 #define WEBSOCKETS_NETWORK_SERVER_CLASS WiFiServer
 
+#elif(WEBSOCKETS_NETWORK_TYPE == NETWORK_CUSTOM)
+#include <NetworkClient.h>
+#include <WiFiServer.h>
+
+#define SSL_AXTLS
+#define WEBSOCKETS_NETWORK_CLASS NetworkClient
+#define WEBSOCKETS_NETWORK_SSL_CLASS NetworkClient
+#define WEBSOCKETS_NETWORK_SERVER_CLASS WiFiServer
 #else
 #error "no network type selected!"
 #endif