add simple serial receive and transmit test for uint8_t, uint16_t, int16_t and float

serialtest_sender_arduino/serialtest_sender_arduino.ino

@@ -0,0 +1,19 @@
+uint8_t counter=0;
+uint16_t value1=65531;
+int16_t value2=-123;
+float floatvalue=23.42;
+
+void setup() {
+  pinMode(LED_BUILTIN, OUTPUT);
+  Serial.begin(9600);
+}
+
+void loop() {
+  digitalWrite(LED_BUILTIN,!digitalRead(LED_BUILTIN));
+  Serial.write((uint8_t *) &counter, sizeof(counter));//uint8_t, 1 byte
+  Serial.write((uint8_t *) &value1, sizeof(value1)); //uint16_t, 2 bytes
+  Serial.write((uint8_t *) &value2, sizeof(value2)); //int16_t, 2 bytes
+  Serial.write((uint8_t *) &floatvalue, sizeof(floatvalue)); //float, 4 bytes
+  delay(500);
+  counter++;
+}