impr: server loopback example, fix dispatcher_example

Author: eigen-value

examples/dispatcher_example/dispatcher_example.ino

@@ -12,7 +12,7 @@ MsgPack::Unpacker unpacker;
 
 MsgPack::Packer out_packer;
 
-RpcFunctionDispatcher dispatcher;
+RpcFunctionDispatcher<100> dispatcher;
 
 void blink_before(){
     digitalWrite(LED_BUILTIN, HIGH);

examples/rpc_lite_client/rpc_lite_client.ino

@@ -30,6 +30,10 @@ void loop() {
     float result;
     blink_before();
 
+    String str_res;
+    bool ko = client.call("loopback", str_res, "Sending a greeting");
+    Serial.println(str_res);
+
     bool ok = client.call("mult", result, 2.0, 3.0);
 
     if (ok) {

examples/rpc_lite_server/rpc_lite_server.ino

@@ -12,6 +12,10 @@ MsgPack::str_t greet(){
     return MsgPack::str_t ("Hello Friend");
 }
 
+MsgPack::str_t loopback(MsgPack::str_t message){
+    return message;
+}
+
 void setup() {
     Serial2.begin(115200);
     transport.begin();

extras/examples/serial_server_example.py

@@ -7,6 +7,9 @@ def add(a, b):
 def greet(name):
     return f"Hello, {name}!"
 
+def loopback(message):
+    return message
+
 def multiply(a, b):
     return a*b
 
@@ -42,6 +45,7 @@ def get_rand():
 server.register_callback('greet', greet)
 server.register_callback('blink', blink)
 server.register_callback('get_rand', get_rand)
+server.register_callback('loopback', loopback)
 
 server.start()
 
@@ -51,4 +55,4 @@ def get_rand():
         pass  # Keep main thread alive
 except KeyboardInterrupt:
     server.stop()
-    print("\nSerial server stopped.")
+    print("\nSerial server stopped.")