diff --git a/src/rbprotocol.cpp b/src/rbprotocol.cpp
index 7981056..61e71c2 100644
--- a/src/rbprotocol.cpp
+++ b/src/rbprotocol.cpp
@@ -15,6 +15,13 @@ namespace rb {
 
 using namespace rb::internal;
 
+const ProtocolConfig Protocol::DEFAULT_CONFIG = {
+    .enable_udp = true,
+    .enable_ws = true,
+    .ws_register_with_webserver = true,
+    .udp_port = 42424,
+};
+
 Protocol::Protocol(const char* owner, const char* name, const char* description, Protocol::callback_t callback) {
     m_owner = owner;
     m_name = name;
diff --git a/src/rbprotocol.h b/src/rbprotocol.h
index 54ea942..1e6ccfe 100644
--- a/src/rbprotocol.h
+++ b/src/rbprotocol.h
@@ -10,6 +10,7 @@
 #include <freertos/queue.h>
 #include <functional>
 #include <string>
+#include <mutex>
 
 
 #include "rbjson.h"
@@ -64,12 +65,7 @@ class Protocol {
 public:
     typedef std::function<void(const std::string& cmd, rbjson::Object* pkt)> callback_t;
 
-    static constexpr const ProtocolConfig DEFAULT_CONFIG = {
-        .enable_udp = true,
-        .enable_ws = true,
-        .ws_register_with_webserver = true,
-        .udp_port = 42424,
-    };
+    static const ProtocolConfig DEFAULT_CONFIG;
 
     Protocol(const char* owner, const char* name, const char* description, callback_t callback = nullptr);
     ~Protocol();
diff --git a/src/rbwebserver.c b/src/rbwebserver.c
index ed6b271..9746da8 100644
--- a/src/rbwebserver.c
+++ b/src/rbwebserver.c
@@ -338,7 +338,7 @@ static void parse_request(int fd, http_request* req) {
 
         int length = strlen(filename);
         if (length == 0) {
-            filename = ".";
+            filename = (char*)".";
         } else {
             for (int i = 0; i < length; ++i) {
                 if (filename[i] == '?') {
@@ -450,8 +450,7 @@ static void process_serve_file(int fd, struct sockaddr_in* clientaddr, http_requ
     int ffd = prepare_gzip(req);
     if (ffd <= 0) {
         status = 404;
-        char* msg = "File not found";
-        client_error(fd, status, "Not found", msg);
+        client_error(fd, status, "Not found", "File not found");
     } else {
         fstat(ffd, &sbuf);
         if (S_ISREG(sbuf.st_mode)) {
@@ -464,8 +463,7 @@ static void process_serve_file(int fd, struct sockaddr_in* clientaddr, http_requ
             serve_static(fd, ffd, req, sbuf.st_size);
         } else {
             status = 400;
-            char* msg = "Unknow Error";
-            client_error(fd, status, "Error", msg);
+            client_error(fd, status, "Error", "Unknow Error");
         }
         close(ffd);
     }
diff --git a/src/rbwifi.h b/src/rbwifi.h
index 7ef9e43..a66f561 100644
--- a/src/rbwifi.h
+++ b/src/rbwifi.h
@@ -1,6 +1,7 @@
 #pragma once
 
 #include <atomic>
+#include <string>
 
 #if defined(ESP_IDF_VERSION_VAL)
 #if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(4, 1, 0)