Add a realtime command detector - WIP

esp3d/src/core/esp3d_commands.cpp

@@ -1205,10 +1205,6 @@ void ESP3DCommands::process(ESP3DMessage *msg) {
     esp3d_log("Execute internal command %d", cmdId);
     execute_internal_command(cmdId, espcmdpos, msg);
   } else {
-    /*esp3d_log("Dispatch command, len %d, from %d(%s) to %d(%s)", msg->size,
-              static_cast<uint8_t>(msg->origin), GETCLIENTSTR(msg->origin),
-              static_cast<uint8_t>(msg->target), GETCLIENTSTR(msg->target));*/
-
     // Work around to avoid to dispatch single \n or \r to everyone as it is
     // part of previous ESP3D command
     if (msg->size == 1 &&

esp3d/src/core/esp3d_string.cpp

@@ -264,4 +264,19 @@ const char* esp3d_string::formatDuration(uint64_t duration) {
   result += String(seconds) + "s";
 
   return result.c_str();
+}
+
+bool esp3d_string::isRealtimeCommand(char c) {
+    // Standard characters
+    if (c == '?' || c == '!' || c == '~' || c == 0x18) {  // 0x18 is  ^X
+        return true;
+    }
+
+    // Range >= 0x80 et <= 0xA4
+    const unsigned char uc = static_cast<unsigned char>(c);
+    if (uc >= 0x80 && uc <= 0xA4) {
+        return true;
+    }
+
+    return false;
 }

esp3d/src/core/esp3d_string.h

@@ -31,6 +31,7 @@ const char* formatBytes(uint64_t bytes);
 bool isPrintableChar(char c);
 const char* expandString(const char* s, bool formatspace = false);
 const char * urlEncode(const char* s);
+bool isRealtimeCommand(char c);
 }  // namespace esp3d_string
 
 #endif  //_ESP3D_STRING_H