update

README.md

@@ -45,11 +45,12 @@ Copy ```/src/rpi-cpu2mqtt.py``` and ```/src/config.py.example``` to a folder of
 
 Populate the variables for MQTT host, user, password and main topic in ```config.py```.
 
-You can also choose what messages are send and what is the delay between them.
-
+You can also choose what messages are send and what is the delay (sleep_time is only used for multiple messages) between them.
+If you are sending a grouped message and you want to delay the execution of the script you need to use the ```random_delay``` variable which is set to 30 by default.
 This is the default configuration:
 
 ```
+random_delay = randrange(30)
 group_messages = True 
 sleep_time = 0.5
 cpu_load = True

src/config.py.example

@@ -1,5 +1,7 @@
+from random import randrange
+
 # MQTT server configuration
-mqtt_host = "192.168.0.13"
+mqtt_host = "ip address or host"
 mqtt_user = "user"
 mqtt_password = "password"
 mqtt_port = "1883"
@@ -7,9 +9,14 @@ mqtt_topic_prefix = "rpi-MQTT-monitor"
 
 # Messages configuration
 
-# If this is send to True the script will send just one message containing all values 
+# If this is set to True the script will send just one message containing all values 
 group_messages = True
 
+# Random delay in seconds before measuring the values 
+# - this is used for de-synchronizing message if you run this script on many hosts, set this to 0 for no delay.
+# - if you want a fix delay you can remove the randarnge function and just set the needed delay.
+random_delay = randrange(30)
+
 # This is the time  between sending the indivudual messages
 sleep_time = 0.5
 cpu_load = True

src/rpi-cpu2mqtt.py

@@ -112,6 +112,9 @@ if __name__ == '__main__':
 		# set all monitored values to False in case they are turned off in the config
 		cpu_load = cpu_temp = used_space = voltage = sys_clock_speed = swap = memory = False
 		
+		# delay the execution of the script
+		time.sleep(config.random_delay)
+		
 		# collect the monitored values		
 		if config.cpu_load:
 			cpu_load = check_cpu_load()