Simple Python MQTT Data Logger by Topic
. This software monitors a group of topics and creates a log file for each topic to which this MQTT client has subscribed.
You can specify the root log directory when starting defaults to tlogs
.
Default log size is 5MB You need to provide the script with:
List of topics to monitor
broker name and port
username and password if needed.
base log directory and number of logs have defaults
Valid command line Options:
--help
-h
-b
-p
-t
-q
-v
-d logging debug
-n
-u Username
-P Password
-s
-l
-T test mode when use with the data logger tester
-r Record size in bytes default=10000
-c log in csv format
-f -f filename of header file default is data.csv
Example Usage:
You will always need to specify the broker name or IP address and the topics to log
Note: you may not need to use the python prefix or may need to use python3 mqtt-topic-logger.py (Linux)
Specify broker and topics
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/#
Specify broker and multiple topics
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -t home/#
Log All Data:
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -s
Specify the client name used by the logger
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -n data-logger
Specify the log directory
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -l mylogs
Log in CSV format
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -c
Log in CSV format and use data.csv header file
python mqtt-topic-logger.py -h 192.168.1.157 -t sensors/# -c -f data.csv
Logger Class
The class is implemented in a module called tlogger.py (topic logger).
To create an instance you ca supply two parameters:
The log directory- defaults to tlogs
Max Log Size defaults to 5MB
log=tlogger.T_logger(log_dir)
The logger creates the log files in the directory using the topic names for the directory names and log files starting with log000.txt When the file reaches 5Mb it is rotated
log data is JSON format with a timestamp added to the message
The logger will return True if successful and False if not.
To prevent loss of data in the case of computer failure the logs are continuously flushed to disk .
The logger will not clear log files when you start the logger you should ensure the log directory is empty. When logging to a csv file you can change the default header order using a header file. Each topic requires its own header entry. Below is an example header file:
test/sensor1,time_ms,time,ms,Urms,Umin,Umax test/sensor2,time_ms,time,ms,Urms,Umin,Umax test/sensor3,time_ms,time,sensor,count,status test/sensor4,time_ms,time,ms,Urms,Umin,Umax,count
You can see that topics sensor1 and sensor2 use the same header whereas sensor3 and sensor4 have different headers. Because topics can have different json foramts the better option is to let the script build the header file rather than supplying one.
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