From: Roger A. Light <roger@atchoo.org>
Date: Tue, 21 Oct 2014 14:20:01 +0000 (+0100)
Subject: Display help on error.
X-Git-Url: https://git.michaelhowe.org/gitweb/?a=commitdiff_plain;h=1c449873e424adc721dbbdf96b176009caa8a1c7;p=packages%2Fp%2Fpaho-mqtt.git

Display help on error.

Change-Id: I379a635360c99eb79bc9bb660e4c3b2659003c95
---

diff --git a/examples/mqtt_clear_retain.py b/examples/mqtt_clear_retain.py
index 13f5754..dc35f67 100755
--- a/examples/mqtt_clear_retain.py
+++ b/examples/mqtt_clear_retain.py
@@ -94,7 +94,8 @@ def main(argv):
             verbose = True
 
     if topic == None:
-        print("You must provide a topic to clear.")
+        print("You must provide a topic to clear.\n")
+        print_usage()
         sys.exit(2)
 
     mqttc = mqtt.Client(client_id)