copying Firmata-0.4beta2 release into trunk, then I'll adjust it to Arduino-0012

hardware/libraries/Firmata/examples/EchoString/EchoString.pde

@@ -0,0 +1,40 @@
+/* This sketch accepts strings and raw sysex messages and echos them back.
+ *
+ * This example code is in the public domain.
+ */
+#include <Firmata.h>
+
+byte analogPin;
+
+void stringCallback(char *myString)
+{
+    Firmata.sendString(myString);
+}
+
+
+void sysexCallback(byte command, byte argc, byte*argv)
+{
+    Serial.print(START_SYSEX, BYTE);
+    Serial.print(command, BYTE);
+    for(byte i=0; i<argc; i++) {
+        Serial.print(argv[i], BYTE);
+    }
+    Serial.print(END_SYSEX, BYTE);
+}
+
+void setup()
+{
+    Firmata.setFirmwareVersion(0, 1);
+    Firmata.attach(FIRMATA_STRING, stringCallback);
+    Firmata.attach(START_SYSEX, sysexCallback);
+    Firmata.begin();
+}
+
+void loop()
+{
+    while(Firmata.available()) {
+        Firmata.processInput();
+    }
+}
+
+