Add new hardware: Heltec MeshPocket (#6533)

* Add Heltec MeshPocket.

* MeshPocket source code update

* Optimiz code for refresh border during full update.

* Update Heltec MeshPocket json file info.

src/graphics/niche/Drivers/EInk/LCMEN2R13ECC1.cpp

@@ -0,0 +1,68 @@
+#include "./LCMEN2R13ECC1.h"
+
+#ifdef MESHTASTIC_INCLUDE_NICHE_GRAPHICS
+
+using namespace NicheGraphics::Drivers;
+
+// Map the display controller IC's output to the connected panel
+void LCMEN2R13ECC1::configScanning()
+{
+    // "Driver output control"
+    sendCommand(0x01);
+    sendData(0xF9);
+    sendData(0x00);
+    sendData(0x00);
+
+    // To-do: delete this method?
+    // Values set here might be redundant: F9, 00, 00 seems to be default
+}
+
+// Specify which information is used to control the sequence of voltages applied to move the pixels
+// - For this display, configUpdateSequence() specifies that a suitable LUT will be loaded from
+//   the controller IC's OTP memory, when the update procedure begins.
+void LCMEN2R13ECC1::configWaveform()
+{
+    switch (updateType) {
+        case FAST:
+            sendCommand(0x3C); // Border waveform:
+            sendData(0x85);
+            break;
+    
+        case FULL:
+        default:
+            // From OTP memory
+            break;
+        }
+}
+
+void LCMEN2R13ECC1::configUpdateSequence()
+{
+    switch (updateType) {
+    case FAST:
+        sendCommand(0x22); // Set "update sequence"
+        sendData(0xFF);    // Will load LUT from OTP memory, Display mode 2 "differential refresh"
+        break;
+
+    case FULL:
+    default:
+        sendCommand(0x22); // Set "update sequence"
+        sendData(0xF7);    // Will load LUT from OTP memory
+        break;
+    }
+}
+
+// Once the refresh operation has been started,
+// begin periodically polling the display to check for completion, using the normal Meshtastic threading code
+// Only used when refresh is "async"
+void LCMEN2R13ECC1::detachFromUpdate()
+{
+    switch (updateType) {
+    case FAST:
+        return beginPolling(50, 800); // At least 500ms for fast refresh
+    case FULL:
+    default:
+        return beginPolling(100, 2500); // At least 2 seconds for full refresh
+    }
+}
+
+#endif   // MESHTASTIC_INCLUDE_NICHE_GRAPHICS