adding double support for JSON.

Changelog

@@ -1,3 +1,6 @@
+2026-03-13:
+- json could not handle double types.
+
 2026-02-15:
 - webserver exited if file was not found. Return error code and keep running
 - webserver did not set the document root as expected 

UDPTCPNetwork-json.h

@@ -52,6 +52,7 @@ public:
 	int GetValue(std::string varname, std::string *dest);
 	int GetValueInt(std::string varname, int *dest);
 	int GetValueInt64(std::string varname, int64_t *dest);
+	int GetValueDouble(std::string varname, double *dest);
 	int GetValueString(std::string varname, std::string *dest);
 	int GetObject(std::string varname, JSONParse *dest);
 

json.cc

@@ -230,6 +230,17 @@ int JSONParse::GetValueInt64(std::string varname, int64_t *dest) {
 };
 
 
+int JSONParse::GetValueDouble(std::string varname, double *dest) {
+	std::string s;
+	int res = GetValue(varname, &s);
+	if (res) {
+		*dest = atof (s.c_str());
+		return 1;
+	}
+	return 0;
+};
+
+
 int JSONParse::GetValueString(std::string varname, std::string *dest) {
 	std::string s;
 	int res = GetValue(varname, &s);