From c64ba3178f14a8c1b3793bd24c8eefa80192eb43 Mon Sep 17 00:00:00 2001
From: grizeldi <grizeldi@gmail.com>
Date: Sun, 18 Feb 2024 19:01:59 +0100
Subject: [PATCH 1/3] Pioneer DDJ-FLX4: Added a keep alive timer which prevents
 the controller from entering BT pairing mode while connected

---
 res/controllers/Pioneer-DDJ-FLX4-script.js | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/res/controllers/Pioneer-DDJ-FLX4-script.js b/res/controllers/Pioneer-DDJ-FLX4-script.js
index 53d8543d2f6..8165687b8f6 100644
--- a/res/controllers/Pioneer-DDJ-FLX4-script.js
+++ b/res/controllers/Pioneer-DDJ-FLX4-script.js
@@ -169,6 +169,11 @@ PioneerDDJFLX4.lights = {
 // Store timer IDs
 PioneerDDJFLX4.timers = {};
 
+// Keep alive timer
+PioneerDDJFLX4.sendKeepAlive = function() {
+    midi.sendSysexMsg([0xF0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x04, 0x05, 0x00, 0x50, 0x02, 0xf7], 12);
+};
+
 // Jog wheel constants
 PioneerDDJFLX4.vinylMode = true;
 PioneerDDJFLX4.alpha = 1.0/8;
@@ -265,8 +270,10 @@ PioneerDDJFLX4.init = function() {
     }
     engine.makeConnection("[EffectRack1_EffectUnit1]", "focused_effect", PioneerDDJFLX4.toggleFxLight);
 
+    PioneerDDJFLX4.keepAliveTimer = engine.beginTimer(200, PioneerDDJFLX4.sendKeepAlive);
+
     // query the controller for current control positions on startup
-    midi.sendSysexMsg([0xF0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x02, 0x06, 0x00, 0x03, 0x01, 0xf7], 12);
+    PioneerDDJFLX4.sendKeepAlive(); // the query seems to double as a keep alive message
 };
 
 //
@@ -807,4 +814,7 @@ PioneerDDJFLX4.shutdown = function() {
     // stop any flashing lights
     PioneerDDJFLX4.toggleLight(PioneerDDJFLX4.lights.beatFx, false);
     PioneerDDJFLX4.toggleLight(PioneerDDJFLX4.lights.shiftBeatFx, false);
+
+    // stop the keepalive timer
+    engine.stopTimer(PioneerDDJFLX4.keepAliveTimer);
 };

From 6bbaa0b9e4a3338e7b852b9175464b68884e0489 Mon Sep 17 00:00:00 2001
From: grizeldi <grizeldi@gmail.com>
Date: Sun, 18 Feb 2024 19:47:22 +0100
Subject: [PATCH 2/3] Pioneer DDJ-FLX4: Removed headphone gain mapping, as it's
 done in hardware

---
 res/controllers/Pioneer-DDJ-FLX4.midi.xml | 21 ---------------------
 1 file changed, 21 deletions(-)

diff --git a/res/controllers/Pioneer-DDJ-FLX4.midi.xml b/res/controllers/Pioneer-DDJ-FLX4.midi.xml
index c022a68c7bd..1e99c3d0cbd 100644
--- a/res/controllers/Pioneer-DDJ-FLX4.midi.xml
+++ b/res/controllers/Pioneer-DDJ-FLX4.midi.xml
@@ -930,27 +930,6 @@
                     <fourteen-bit-msb/>
                 </options>
             </control>
-
-            <control>
-                <description>HEADPHONES LEVEL - rotate - Headphone gain</description>
-                <group>[Master]</group>
-                <key>headGain</key>
-                <status>0xB6</status>
-                <midino>0x2D</midino>
-                <options>
-                    <fourteen-bit-lsb/>
-                </options>
-            </control>
-            <control>
-                <description>HEADPHONES LEVEL - rotate - Headphone gain</description>
-                <group>[Master]</group>
-                <key>headGain</key>
-                <status>0xB6</status>
-                <midino>0x0D</midino>
-                <options>
-                    <fourteen-bit-msb/>
-                </options>
-            </control>
             <!-- MIXER Section END -->
 
             <!-- EFFECT Section START -->

From 860576b37d8c27afe544111e107a9013eea8c9fa Mon Sep 17 00:00:00 2001
From: grizeldi <grizeldi@gmail.com>
Date: Sun, 18 Feb 2024 22:05:04 +0100
Subject: [PATCH 3/3] Pioneer DDJ-FLX4: Added reverse engineering notice

---
 res/controllers/Pioneer-DDJ-FLX4-script.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/res/controllers/Pioneer-DDJ-FLX4-script.js b/res/controllers/Pioneer-DDJ-FLX4-script.js
index 8165687b8f6..3514f52421e 100644
--- a/res/controllers/Pioneer-DDJ-FLX4-script.js
+++ b/res/controllers/Pioneer-DDJ-FLX4-script.js
@@ -171,7 +171,7 @@ PioneerDDJFLX4.timers = {};
 
 // Keep alive timer
 PioneerDDJFLX4.sendKeepAlive = function() {
-    midi.sendSysexMsg([0xF0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x04, 0x05, 0x00, 0x50, 0x02, 0xf7], 12);
+    midi.sendSysexMsg([0xF0, 0x00, 0x40, 0x05, 0x00, 0x00, 0x04, 0x05, 0x00, 0x50, 0x02, 0xf7], 12); // This was reverse engineered with Wireshark
 };
 
 // Jog wheel constants