Add DEFAULT_KEEPALIVE_INTERVAL setting

Marlin/Configuration.h

@@ -721,9 +721,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/Felix/Configuration.h

@@ -704,9 +704,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/Felix/Configuration_DUAL.h

@@ -701,9 +701,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/Hephestos/Configuration.h

@@ -713,9 +713,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/Hephestos_2/Configuration.h

@@ -715,9 +715,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/K8200/Configuration.h

@@ -738,9 +738,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/RepRapWorld/Megatronics/Configuration.h

@@ -721,9 +721,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/RigidBot/Configuration.h

@@ -716,9 +716,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/SCARA/Configuration.h

@@ -729,9 +729,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/TAZ4/Configuration.h

@@ -742,9 +742,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/WITBOX/Configuration.h

@@ -713,9 +713,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/adafruit/ST7565/Configuration.h

@@ -721,9 +721,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/delta/biv2.5/Configuration.h

@@ -843,9 +843,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/delta/generic/Configuration.h

@@ -843,9 +843,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/delta/kossel_mini/Configuration.h

@@ -847,9 +847,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/delta/kossel_pro/Configuration.h

@@ -840,9 +840,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/delta/kossel_xl/Configuration.h

@@ -757,9 +757,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/makibox/Configuration.h

@@ -724,9 +724,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = false; // set to true to invert the l
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher

Marlin/example_configurations/tvrrug/Round2/Configuration.h

@@ -715,9 +715,12 @@ const bool Z_MIN_PROBE_ENDSTOP_INVERTING = true; // set to true to invert the lo
 // Host Keepalive
 //
 // By default Marlin will send a busy status message to the host
-// every 10 seconds when it can't accept commands.
+// every couple of seconds when it can't accept commands.
 //
 //#define DISABLE_HOST_KEEPALIVE // Enable this option if your host doesn't like keepalive messages.
+#if DISABLED(DISABLE_HOST_KEEPALIVE)
+  #define DEFAULT_KEEPALIVE_INTERVAL 2 // Number of seconds between "busy" messages. Set with M113.
+#endif
 
 //
 // M100 Free Memory Watcher