Added some examples for inkplate 4

Author: KarloLeksic

examples/Inkplate4/Advanced/Communication/Inkplate4_Bluetooth_Peripheral_Mode/Inkplate4_Bluetooth_Peripheral_Mode.ino

@@ -0,0 +1,82 @@
+/*
+   Inkplate4_Bluetooth_Peripheral_Mode example for Soldered Inkplate 4
+   For this example you will need a USB-C cable, Inkplate 4 and smartphone.
+   Select "Soldered Inkplate4" from Tools -> Board menu.
+   Don't have "Soldered Inkplate4" option? Follow our tutorial and add it:
+   https://soldered.com/learn/add-inkplate-6-board-definition-to-arduino-ide/
+
+   This example shows how to use Inkplate as a peripheral device over Bluetooth.
+   More about peripheral mode: https://inkplate.readthedocs.io/en/latest/peripheral-mode.html
+
+   Upload this example to the Inkplate and connect your phone to it via Bluetooth.
+   First, you have to pair the Inkplate with your phone in Bluetooth settings in your phone, then go to the
+   Serial Bluetooth Terminal app and you can find the Inkplate in the device list. You can use another similar app.
+   If Bluetooth starts successfully, you can send commands from your phone. Don't forget you need to send #L(1)* after
+   each command to show it on the display (equal to display->display()).
+
+   Want to learn more about Inkplate? Visit www.inkplate.io
+   Looking to get support? Write on our forums: https://forum.soldered.com/
+   5 April 2023 by Soldered
+*/
+
+// Next 3 lines are a precaution, you can ignore those, and the example would also work without them
+#ifndef ARDUINO_INKPLATE4
+#error "Wrong board selection for this example, please select Soldered Inkplate4 in the boards menu."
+#endif
+
+// Include Inkplate and BluetoothSerial library to the sketch
+#include "BluetoothSerial.h"
+#include "Inkplate.h"
+
+// Include peripheral functions
+#include "Peripheral.h"
+
+// Create an object on Inkplate library
+Inkplate display;
+
+// Create SerialBT object for Bluetooth communication
+BluetoothSerial SerialBT;
+
+// Size of buffer for receiving commands
+#define BUFFER_SIZE 1000
+
+// Temporary buffer to send to Peripheral mode code
+char commandBuffer[BUFFER_SIZE + 1];
+
+void setup()
+{
+    // Init serial communication
+    Serial.begin(115200);
+
+    // Init Inkplate library (you should call this function ONLY ONCE)
+    display.begin();
+
+    // Init BT communication
+    if (!SerialBT.begin("Inkplate4"))
+    {
+        Serial.println("An error occurred initializing Bluetooth");
+    }
+    else
+    {
+        Serial.println("The device started, now you can pair it with Bluetooth and send commands!");
+    }
+}
+
+void loop()
+{
+    // When Bluetooth available save it and pass to Peripheral.h code
+    while (SerialBT.available())
+    {
+        for (int i = 0; i < (BUFFER_SIZE - 1); i++)
+        {
+            commandBuffer[i] = commandBuffer[i + 1];
+        }
+        commandBuffer[BUFFER_SIZE - 1] = SerialBT.read();
+    }
+
+    // Function in peripheral.h
+    run(commandBuffer, BUFFER_SIZE, &display, &SerialBT);
+
+    // Wait a bit
+    delay(50);
+}