LI-COR LI-7820, Instruction Manual

Page: 75 / 92

Downloading data in a date and time range
The following script will download data from instrument. The script includes a
date and time range, file duration (minutes), as well as the directory that the files
are saved to, all of which can be modified to suit your needs. This program uses the
Python
requests
libraries, so we'll begin by installing those.
1 Install the
requests
libraries.
Launch a terminal on Mac or command prompt on Windows. Type
pip install
requests
or
sudo pip install requests
in the command line tool. The ter-
minal will issue a few replies indicating success.
2 Create the python script to save the data.
Copy the following into a text file and save it to your computer's desktop (or
another directory) with a
.py
extension, like
import-datetime.py
.
import datetime
import requests
import socket
slno = 'tgXX-01009.local'
ip = socket. gethostbyname (slno)
dl1 = "http://" + ip+ ":8080/ExportAdvancedData?tmin="
dl2 = "&tmax="
tmz = "-06:00"
dt = datetime. datetime ( 2019 , 5 , 10 , 0 , 0 , 0 )
end = datetime. datetime ( 2019 , 5 , 11 , 0 , 0 , 0 )
step = datetime. timedelta (minutes= 30 )
fls = []
ts5= []
while dt <= end:
ts1 = dt. strftime ( '%Y-%m-%d %H:%M:%S' )
ts3 = dt. strftime ( '%Y-%m-%d %H-%M-%S' )
ts2 = ts1[ 0 : 10 ] + "T" +ts1[ 11 :]
ts4 = ts1[ 0 : 10 ] + "T" +ts3[ 11 :] + ".txt" ;
ts5. append (ts4)
fls. append (ts2)
dt += step
print (fls)
for i in range ( 0 , len (fls)- 1 , 1 ):
Section 7. Communication with the MQTT protocol
7-9 Downloading data in a date and time range