diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index b40615524..40728fd2c 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index ed57d2b9c..5517b8e18 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -733,8 +733,20 @@ 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();
+  
+    if (!MYSERIAL.available() && commands_in_queue == 0 && ms - last_command_time > NO_TIMEOUTS) {
+      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' ||
@@ -5523,7 +5535,12 @@ void ClearToSend() {
   #ifdef SDSUPPORT
     if (fromsd[cmd_queue_index_r]) return;
   #endif
-  SERIAL_PROTOCOLLNPGM(MSG_OK);
+  SERIAL_PROTOCOLPGM(MSG_OK);
+  #ifdef ADVANCED_OK
+    SERIAL_PROTOCOLPGM(" N"); SERIAL_PROTOCOL(gcode_LastN);
+    SERIAL_PROTOCOLPGM(" P"); SERIAL_PROTOCOL(BUFSIZE - commands_in_queue);
+  #endif
+  SERIAL_EOL;  
 }
 
 void get_coordinates() {
diff --git a/Marlin/configurator/config/Configuration_adv.h b/Marlin/configurator/config/Configuration_adv.h
index b40615524..40728fd2c 100644
--- a/Marlin/configurator/config/Configuration_adv.h
+++ b/Marlin/configurator/config/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/Felix/Configuration_adv.h b/Marlin/example_configurations/Felix/Configuration_adv.h
index 9384ed553..9fefd05b2 100644
--- a/Marlin/example_configurations/Felix/Configuration_adv.h
+++ b/Marlin/example_configurations/Felix/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/Hephestos/Configuration_adv.h b/Marlin/example_configurations/Hephestos/Configuration_adv.h
index 58159fe36..765a098e3 100644
--- a/Marlin/example_configurations/Hephestos/Configuration_adv.h
+++ b/Marlin/example_configurations/Hephestos/Configuration_adv.h
@@ -377,7 +377,15 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 
 //The ASCII buffer for receiving from the serial:
 #define MAX_CMD_SIZE 96
-#define BUFSIZE 5
+#define BUFSIZE 4
+
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
 
 // @section fwretract
 
diff --git a/Marlin/example_configurations/K8200/Configuration_adv.h b/Marlin/example_configurations/K8200/Configuration_adv.h
index 9384ed553..9fefd05b2 100644
--- a/Marlin/example_configurations/K8200/Configuration_adv.h
+++ b/Marlin/example_configurations/K8200/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/SCARA/Configuration_adv.h b/Marlin/example_configurations/SCARA/Configuration_adv.h
index 146e7fab1..49aef0933 100644
--- a/Marlin/example_configurations/SCARA/Configuration_adv.h
+++ b/Marlin/example_configurations/SCARA/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/WITBOX/Configuration_adv.h b/Marlin/example_configurations/WITBOX/Configuration_adv.h
index a4d8f65f9..004a9161c 100644
--- a/Marlin/example_configurations/WITBOX/Configuration_adv.h
+++ b/Marlin/example_configurations/WITBOX/Configuration_adv.h
@@ -377,7 +377,15 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 
 //The ASCII buffer for receiving from the serial:
 #define MAX_CMD_SIZE 96
-#define BUFSIZE 5
+#define BUFSIZE 4
+
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
 
 // @section fwretract
 
diff --git a/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h b/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
index 0807c999b..a9e811d84 100644
--- a/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/biv2.5/Configuration_adv.h
@@ -380,6 +380,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/delta/generic/Configuration_adv.h b/Marlin/example_configurations/delta/generic/Configuration_adv.h
index 9f1fda4a4..8665b0303 100644
--- a/Marlin/example_configurations/delta/generic/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/generic/Configuration_adv.h
@@ -380,6 +380,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
index b36e8a0f3..912c886c0 100644
--- a/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
+++ b/Marlin/example_configurations/delta/kossel_mini/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/makibox/Configuration_adv.h b/Marlin/example_configurations/makibox/Configuration_adv.h
index 411985f79..dfbb19381 100644
--- a/Marlin/example_configurations/makibox/Configuration_adv.h
+++ b/Marlin/example_configurations/makibox/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
index 572fdb6bf..d708d0f25 100644
--- a/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
+++ b/Marlin/example_configurations/tvrrug/Round2/Configuration_adv.h
@@ -379,6 +379,14 @@ const unsigned int dropsegments=5; //everything with less than this number of st
 #define MAX_CMD_SIZE 96
 #define BUFSIZE 4
 
+// Bad Serial-connections can miss a received command by sending an 'ok'
+// Therefore some clients go after 30 seconds in a timeout. Some other clients start sending commands while receiving a 'wait'.
+// This wait is only send when the buffer is empty. The timeout-length is in milliseconds. 1000 is a good value.
+#define NO_TIMEOUTS 1000
+
+// Some clients will have this feature soon. This could make the NO_TIMEOUTS unnecessary.
+#define ADVANCED_OK
+
 // @section fwretract
 
 // Firmware based and LCD controlled retract
diff --git a/Marlin/language.h b/Marlin/language.h
index 40d8dbe66..789b98c67 100644
--- a/Marlin/language.h
+++ b/Marlin/language.h
@@ -122,6 +122,7 @@
 #define MSG_FREE_MEMORY                     " Free Memory: "
 #define MSG_PLANNER_BUFFER_BYTES            "  PlannerBufferBytes: "
 #define MSG_OK                              "ok"
+#define MSG_WAIT                            "wait"
 #define MSG_FILE_SAVED                      "Done saving file."
 #define MSG_ERR_LINE_NO                     "Line Number is not Last Line Number+1, Last Line: "
 #define MSG_ERR_CHECKSUM_MISMATCH           "checksum mismatch, Last Line: "