test: notification with optional param, RPC methods returning nil (py None)

Author: eigen-value

examples/rpc_lite_client/rpc_lite_client.ino

@@ -55,5 +55,19 @@ void loop() {
     client.notify("blink");
     Serial.println("Sent a blink notification");
 
+    int duration_ms = 100;
+    client.notify("blink", duration_ms);
+    Serial.println("Sent a 100ms blink notification");
+
+    MsgPack::object::nil_t out;
+    ok = client.call("blink", out);
+    Serial.print("Sent a blink RPC -> ");
+
+    if (ok) {
+        Serial.println("Server returns without issues");
+    } else {
+        Serial.println("Server could not handle a notification as a call");
+    }
+
     delay(2000);
 }

extras/examples/serial_server_example.py

@@ -15,11 +15,14 @@ def divide(a, b):
         print("0 denominator: this will raise an exception")
     return a/b
 
-def blink():
+def blink(duration=None):
     """
-    Used for notification
+    Used for notification w/o parameter. Use also for testing calls returning None
     """
-    print("Blink maybe")
+    if duration is not None:
+        print(f"Blink for {duration}")
+    else:
+        print("Blink maybe")
 
 def get_rand():
     """