make 'wait' optional and mark as workaround

Marlin/Configuration_adv.h

@@ -374,6 +374,10 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Some Hosts doesn't have a timeout for resend a command.
+// This is a workaround for them. If your printer sometimes stuck and stop printing this could help.
+// #define NO_TIMEOUTS
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract

Marlin/Marlin_main.cpp

@@ -724,6 +724,7 @@ void get_command() {
 
   if (drain_queued_commands_P()) return; // priority is given to non-serial commands
   
+  #ifdef NO_TIMEOUTS
     static millis_t last_command_time = 0;
     millis_t ms = millis();
   
@@ -731,9 +732,12 @@ void get_command() {
       SERIAL_ECHOLNPGM(MSG_WAIT);
       last_command_time = ms;
     }
+  #endif
   
   while (MYSERIAL.available() > 0 && commands_in_queue < BUFSIZE) {
+    #ifdef NO_TIMEOUTS
       last_command_time = ms;
+    #endif
     serial_char = MYSERIAL.read();
 
     if (serial_char == '\n' || serial_char == '\r' ||