feat: Add calculator example with Commander

.travis.yml

@@ -27,6 +27,7 @@ env:
     - PLATFORMIO_CI_SRC=examples/Sending
     - PLATFORMIO_CI_SRC=examples/NestedData
     - PLATFORMIO_CI_SRC=examples/Commander
+    - PLATFORMIO_CI_SRC=examples/CommanderCalculator
 
 addons:
   apt:

examples/CommanderCalculator/CommanderCalculator.ino

@@ -0,0 +1,84 @@
+#include <serde-commander.h>
+
+/**
+ * This example shows the same use-case as DifferentTypesForTXandRX,
+ * but using Commander instead of manually checking the operation type.
+ *
+ * As the result is a plain float value, we'll use a standard Serde
+ * interface, no need for a Commander here, as long as the other
+ * end uses CommanderTX and SerdeRX.
+ */
+
+using SerdeTX = Serde<float>;
+
+// RX Commands
+
+struct UnaryOperation
+{
+    float a;
+};
+struct TwoArgumentsOperation
+{
+    float a;
+    float b;
+};
+
+using Add       = TwoArgumentsOperation;
+using Subtract  = TwoArgumentsOperation;
+using Multiply  = TwoArgumentsOperation;
+using Divide    = TwoArgumentsOperation;
+using Negate    = UnaryOperation;
+using Abs       = UnaryOperation;
+
+void onAddReceived(const Add& args)
+{
+    SerdeTX::send(args.a + args.b, SERIAL_PORT_HARDWARE);
+}
+
+void onSubtractReceived(const Subtract& args)
+{
+    SerdeTX::send(args.a - args.b, SERIAL_PORT_HARDWARE);
+}
+
+void onMultiplyReceived(const Multiply& args)
+{
+    SerdeTX::send(args.a * args.b, SERIAL_PORT_HARDWARE);
+}
+
+void onDivideReceived(const Divide& args)
+{
+    SerdeTX::send(args.a / args.b, SERIAL_PORT_HARDWARE);
+}
+
+void onNegateReceived(const Negate& args)
+{
+    SerdeTX::send(-args.a, SERIAL_PORT_HARDWARE);
+}
+
+void onAbsReceived(const Abs& args)
+{
+    SerdeTX::send(args.a > 0 ? args.a : -args.a, SERIAL_PORT_HARDWARE);
+}
+
+SERDE_COMMANDER_CREATE_RX(CommanderRX,
+    Add,
+    Subtract,
+    Multiply,
+    Divide,
+    Negate,
+    Abs
+);
+
+// --
+
+void setup()
+{
+    // SERIAL_PORT_HARDWARE aliases to the default
+    // hardware serial port on your board.
+    SERIAL_PORT_HARDWARE.begin(115200);
+}
+
+void loop()
+{
+    CommanderRX::read(SERIAL_PORT_HARDWARE);
+}