diff --git a/README.md b/README.md
index 6913946..bcf4f2f 100644
--- a/README.md
+++ b/README.md
@@ -26,9 +26,25 @@ source mqttmock/bin/activate
 pip install -r requirements.txt
 ```
 
+---
 
-```
+brokerに送信する
+
+
+```sh
 apt install mosquitto-clients
 
 mosquitto_pub -h localhost -p 1883 -t "device" -m '{"msg": "test""}'
 ```
+
+サブスクライブを体験する
+
+```sh
+mosquitto_pub -h localhost -p 1883 -t "device/{MQTT_DEVICE_CODE}/command" -m '{"msg": "test""}'
+```
+
+MQTT_DEVICE_CODEが`test0001`の場合
+
+```sh
+mosquitto_pub -h localhost -p 1883 -t "device/test0001/command" -m '{"msg": "test""}'
+```
diff --git a/client/mqtt_client.py b/client/mqtt_client.py
index 1f1626e..ed3df7d 100644
--- a/client/mqtt_client.py
+++ b/client/mqtt_client.py
@@ -13,14 +13,37 @@ MQTT_DEVICE_CODE = os.getenv("MQTT_DEVICE_CODE")
 
 
 def on_connect_mock(client, userdata, flags, rc):
-    print(f"Connected with result code rc={rc}")
+    print(f"on_connect: rc={rc}")
+
+
+def on_disconnect_mock(client, userdata, rc):
+    print(f"on_disconnect: rc={rc}")
+    if rc != 0:
+        print("Unexpected disconnection.")
+
+
+def on_publish_mock(client, userdata, mid):
+    print("on_publish: {0}".format(mid))
+
+
+def on_subscribe_mock(mqttc, obj, mid, granted_qos):
+    print("on_subscribe: "+str(mid)+" "+str(granted_qos))
+
+
+def on_message_mock(client, userdata, msg):
+    print(f"on_message")
+    print("Received message '" + str(msg.payload) +
+          "' on topic '" + msg.topic + "' with QoS " + str(msg.qos))
 
 
 def test_mqtt_mock():
-
     # connect処理
     client = mqtt.Client()
     client.on_connect = on_connect_mock
+    client.on_disconnect = on_disconnect_mock
+    client.on_publish = on_publish_mock
+    client.on_subscribe = on_subscribe_mock
+    client.on_message = on_message_mock
     client.connect(MQTT_HOST, MQTT_PORT, 60)
     topic = f"device/{MQTT_DEVICE_CODE}/command"
     client.subscribe(topic, qos=1)