From b12eb33febe7f4166158aba1b5ad34f535feff3b Mon Sep 17 00:00:00 2001
From: silentninja1 <silent.ninja1@gmail.com>
Date: Wed, 20 Dec 2017 09:22:13 -0500
Subject: [PATCH] Add support for pause and resume action commands on M600

---
 Marlin/Configuration_adv.h | 8 ++++++++
 Marlin/Marlin_main.cpp     | 8 ++++++++
 2 files changed, 16 insertions(+)

diff --git a/Marlin/Configuration_adv.h b/Marlin/Configuration_adv.h
index d2cfff0af..bcae08a0a 100644
--- a/Marlin/Configuration_adv.h
+++ b/Marlin/Configuration_adv.h
@@ -1441,6 +1441,14 @@
  */
 //#define ACTION_ON_KILL "poweroff"
 
+/**
+ * Specify an action command to send to the host on pause and resume.
+ * Will be sent in the form '//action:ACTION_ON_PAUSE', e.g. '//action:pause'.
+ * The host must be configured to handle the action command.
+ */
+//#define ACTION_ON_PAUSE "pause"
+//#define ACTION_ON_RESUME "resume"
+
 //===========================================================================
 //====================== I2C Position Encoder Settings ======================
 //===========================================================================
diff --git a/Marlin/Marlin_main.cpp b/Marlin/Marlin_main.cpp
index 2647a5232..4fb4a39f7 100644
--- a/Marlin/Marlin_main.cpp
+++ b/Marlin/Marlin_main.cpp
@@ -6497,6 +6497,10 @@ inline void gcode_M17() {
   ) {
     if (move_away_flag) return false; // already paused
 
+    #ifdef ACTION_ON_PAUSE
+      SERIAL_ECHOLNPGM("//action:" ACTION_ON_PAUSE);
+    #endif
+
     if (!DEBUGGING(DRYRUN) && unload_length != 0) {
       #if ENABLED(PREVENT_COLD_EXTRUSION)
         if (!thermalManager.allow_cold_extrude &&
@@ -6729,6 +6733,10 @@ inline void gcode_M17() {
       lcd_advanced_pause_show_message(ADVANCED_PAUSE_MESSAGE_STATUS);
     #endif
 
+    #ifdef ACTION_ON_RESUME
+      SERIAL_ECHOLNPGM("//action:" ACTION_ON_RESUME);
+    #endif
+
     #if ENABLED(SDSUPPORT)
       if (sd_print_paused) {
         card.startFileprint();