python/iot3: add test of simple API without OTLP collector

Signed-off-by: Yann E. MORIN <yann.morin@orange.com>

python/iot3/tests/test-iot3-core

@@ -6,9 +6,11 @@ import time
 
 
 def recv(data, topic, payload):
-    print(f"{topic[:16]}: {payload[:16]}")
+    print(f"{topic}: {payload[:16]}")
 
 
+print("IoT3 Core SDK with MQTT and OTLP")
+
 config = iot3.core.sample_config
 config["mqtt"] = {
     "host": "test.mosquitto.org",
@@ -34,3 +36,25 @@ iot3.core.publish(f"{topic}/passed", "passed")
 time.sleep(1)
 
 iot3.core.stop()
+
+
+print("IoT3 Core SDK with MQTT and no OTLP")
+
+del config["otel"]
+
+topic = "test/" + random.randbytes(16).hex() + "/iot3/no-otlp"
+
+iot3.core.start(
+    config=config,
+    message_callback=recv,
+)
+
+iot3.core.subscribe(f"{topic}/+")
+
+iot3.core.publish(f"{topic}/dropped", "dropped")
+time.sleep(1)
+
+iot3.core.publish(f"{topic}/passed", "passed")
+time.sleep(1)
+
+iot3.core.stop()