Add custom osd msg support from external device (#4281)

Add custom osd msg support

Author: haslinghuis

locales/en/messages.json

@@ -5596,7 +5596,38 @@
         "message": "ASL without decimals",
         "description": "One of the variants of the altitude element of the OSD"
     },
-
+    "osdTextElementCustomMsg0": {
+        "message": "Custom message 1",
+        "description": "One of the elements of the OSD"
+    },
+    "osdTextElementCustomMsg1": {
+        "message": "Custom message 2",
+        "description": "One of the elements of the OSD"
+    },
+    "osdTextElementCustomMsg2": {
+        "message": "Custom message 3",
+        "description": "One of the elements of the OSD"
+    },
+    "osdTextElementCustomMsg3": {
+        "message": "Custom message 4",
+        "description": "One of the elements of the OSD"
+    },
+    "osdDescElementCustomMsg0": {
+        "message": "Custom message 1 from external device",
+        "description": "Description of the custom message 1 element of the OSD"
+    },
+    "osdDescElementCustomMsg1": {
+        "message": "Custom message 2 from external device",
+        "description": "Description of the custom message 2 element of the OSD"
+    },
+    "osdDescElementCustomMsg2": {
+        "message": "Custom message 3 from external device",
+        "description": "Description of the custom message 3 element of the OSD"
+    },
+    "osdDescElementCustomMsg3": {
+        "message": "Custom message 4 from external device",
+        "description": "Description of the custom message 4 element of the OSD"
+    },
     "osdTextElementOnTime": {
         "message": "On time",
         "description": "One of the elements of the OSD"

src/js/tabs/osd.js

@@ -1522,6 +1522,42 @@ OSD.loadDisplayFields = function() {
             positionable: true,
             preview: 'DBG2     0     0     0     0',
         },
+        CUSTOM_MSG0: {
+            name: 'CUSTOM_MSG1',
+            text: 'osdTextElementCustomMsg0',
+            desc: 'osdDescElementCustomMsg0',
+            defaultPosition: -1,
+            draw_order: 570,
+            positionable: true,
+            preview: 'CUSTOM MSG1',
+        },
+        CUSTOM_MSG1: {
+            name: 'CUSTOM_MSG2',
+            text: 'osdTextElementCustomMsg1',
+            desc: 'osdDescElementCustomMsg1',
+            defaultPosition: -1,
+            draw_order: 580,
+            positionable: true,
+            preview: 'CUSTOM MSG2',
+        },
+        CUSTOM_MSG2: {
+            name: 'CUSTOM_MSG3',
+            text: 'osdTextElementCustomMsg2',
+            desc: 'osdDescElementCustomMsg2',
+            defaultPosition: -1,
+            draw_order: 590,
+            positionable: true,
+            preview: 'CUSTOM MSG3',
+        },
+        CUSTOM_MSG3: {
+            name: 'CUSTOM_MSG4',
+            text: 'osdTextElementCustomMsg3',
+            desc: 'osdDescElementCustomMsg3',
+            defaultPosition: -1,
+            draw_order: 600,
+            positionable: true,
+            preview: 'CUSTOM MSG4',
+        },
     };
 
     if (semver.gte(FC.CONFIG.apiVersion, API_VERSION_1_47) && have_sensor(FC.CONFIG.activeSensors, 'gps')) {
@@ -1972,6 +2008,10 @@ OSD.chooseFields = function() {
     if (semver.gte(FC.CONFIG.apiVersion, API_VERSION_1_47)) {
         OSD.constants.DISPLAY_FIELDS = OSD.constants.DISPLAY_FIELDS.concat([
             F.DEBUG2,
+            F.CUSTOM_MSG0,
+            F.CUSTOM_MSG1,
+            F.CUSTOM_MSG2,
+            F.CUSTOM_MSG3,
         ]);
     }
     // Choose statistic fields