Move USB Host Shield and Arduino core to lib/ (#13973)

lib/usbhost/USB_Host_Shield_2.0/examples/Bluetooth/SPPMulti/SPPMulti.ino

@@ -0,0 +1,67 @@
+/*
+ Example sketch for the RFCOMM/SPP Bluetooth library - developed by Kristian Lauszus
+ For more information visit my blog: http://blog.tkjelectronics.dk/ or
+ send me an e-mail:  kristianl@tkjelectronics.com
+ */
+
+#include <SPP.h>
+#include <usbhub.h>
+
+// Satisfy IDE, which only needs to see the include statment in the ino.
+#ifdef dobogusinclude
+#include <spi4teensy3.h>
+#include <SPI.h>
+#endif
+
+USB Usb;
+//USBHub Hub1(&Usb); // Some dongles have a hub inside
+
+BTD Btd(&Usb); // You have to create the Bluetooth Dongle instance like so
+
+const uint8_t length = 2; // Set the number of instances here
+SPP *SerialBT[length]; // We will use this pointer to store the instances, you can easily make it larger if you like, but it will use a lot of RAM!
+
+bool firstMessage[length] = { true }; // Set all to true
+
+void setup() {
+  for (uint8_t i = 0; i < length; i++)
+    SerialBT[i] = new SPP(&Btd); // This will set the name to the default: "Arduino" and the pin to "0000" for all connections
+
+  Serial.begin(115200);
+#if !defined(__MIPSEL__)
+  while (!Serial); // Wait for serial port to connect - used on Leonardo, Teensy and other boards with built-in USB CDC serial connection
+#endif
+  if (Usb.Init() == -1) {
+    Serial.print(F("\r\nOSC did not start"));
+    while (1); // Halt
+  }
+  Serial.print(F("\r\nSPP Bluetooth Library Started"));
+}
+
+void loop() {
+  Usb.Task(); // The SPP data is actually not send until this is called, one could call SerialBT.send() directly as well
+
+  for (uint8_t i = 0; i < length; i++) {
+    if (SerialBT[i]->connected) {
+      if (firstMessage[i]) {
+        firstMessage[i] = false;
+        SerialBT[i]->println(F("Hello from Arduino")); // Send welcome message
+      }
+      if (SerialBT[i]->available())
+        Serial.write(SerialBT[i]->read());
+    }
+    else
+      firstMessage[i] = true;
+  }
+
+  // Set the connection you want to send to using the first character
+  // For instance "0Hello World" would send "Hello World" to connection 0
+  if (Serial.available()) {
+    delay(10); // Wait for the rest of the data to arrive
+    uint8_t id = Serial.read() - '0'; // Convert from ASCII
+    if (id < length && SerialBT[id]->connected) { // Make sure that the id is valid and make sure that a device is actually connected
+      while (Serial.available()) // Check if data is available
+        SerialBT[id]->write(Serial.read()); // Send the data
+    }
+  }
+}