ZephyrSSLClient: add setCACert

Author: pennam

libraries/SocketWrapper/ZephyrClient.h

@@ -31,8 +31,8 @@ class ZephyrClient : public arduino::Client, ZephyrSocketWrapper {
         return ret;
     }
 #if defined(CONFIG_NET_SOCKETS_SOCKOPT_TLS)
-    int connectSSL(const char* host, uint16_t port, char* cert) {
-        auto ret = ZephyrSocketWrapper::connectSSL((char*)host, port, cert);
+    int connectSSL(const char* host, uint16_t port, const char* cert) {
+        auto ret = ZephyrSocketWrapper::connectSSL((char*)host, port, (char*)cert);
         if (ret) {
             _connected = true;
         }

libraries/SocketWrapper/ZephyrSSLClient.h

@@ -8,13 +8,18 @@
 
 #if defined(CONFIG_NET_SOCKETS_SOCKOPT_TLS)
 class ZephyrSSLClient : public ZephyrClient {
+private:
+    const char* _cert = nullptr;
 
 public:
     int connect(const char* host, uint16_t port) override {
-        return connectSSL(host, port, nullptr);
+        return connectSSL(host, port, _cert);
     }
-    int connect(const char* host, uint16_t port, char* cert) {
+    int connect(const char* host, uint16_t port, const char* cert) {
         return connectSSL(host, port, cert);
     }
+    void setCACert(const char* cert) {
+        _cert = cert;
+    }
 };
 #endif