add TLS support for all boards

lib_standalone/WiFiClient.h

@@ -0,0 +1,49 @@
+// standalone stub for WiFiClient (no-op networking on host build)
+
+#ifndef WiFiClient_h
+#define WiFiClient_h
+
+#include <stddef.h>
+#include <stdint.h>
+
+#include "Arduino.h"
+#include <ClientPosixIPAddress.h>
+
+class WiFiClient {
+  public:
+    WiFiClient() = default;
+
+    int connect(IPAddress, uint16_t) {
+        return 0;
+    }
+    int connect(const char *, uint16_t) {
+        return 0;
+    }
+    bool connected() {
+        return false;
+    }
+    int available() {
+        return 0;
+    }
+    int read() {
+        return -1;
+    }
+    int read(uint8_t *, size_t) {
+        return 0;
+    }
+    size_t write(uint8_t) {
+        return 0;
+    }
+    size_t write(const uint8_t *, size_t) {
+        return 0;
+    }
+    void stop() {
+    }
+
+    // ESP32 socket option passthrough (e.g. TCP_NODELAY)
+    int setSocketOption(int, int, const void *, size_t) {
+        return 0;
+    }
+};
+
+#endif // WiFiClient_h