added bool->str to serial_bridge_utils - this can probably be improved with a fn using a generic type

src/serial_bridge_utils.hpp

@@ -53,7 +53,7 @@ namespace serial_bridge_utils
 	string string_from_nettype(network_type nettype);
 	//
 	struct RetVals_Transforms
-	{
+	{ // TODO: can these be generalized with generics?
 		static string str_from(uint64_t v)
 		{
 			std::ostringstream o;
@@ -66,6 +66,12 @@ namespace serial_bridge_utils
 			o << v;
 			return o.str();
 		}
+		static string str_from(bool v)
+		{
+			std::ostringstream o;
+			o << v;
+			return o.str();
+		}
 	};
 	string ret_json_from_root(const boost::property_tree::ptree &root);
 	string error_ret_json_from_message(const string &err_msg);