systemdata.py

#References: Thanks to these resoruces!
#http://www.isendev.com/app/entry/39
#https://pythonhosted.org/psutil/

import sys, psutil, datetime, paho.mqtt.client as mqtt, json
from time import gmtime, strftime
import os

def getCPUtemperature():
        try:
                res = os.popen('vcgencmd measure_temp').readline()
                tmp1 = res.replace("temp=","")
                tmp1 = tmp1.replace("'","")
                tmp1 = tmp1.replace("C","")
                #print tmp1
                return tmp1
        except:
                return 0

temp1 = int(float(getCPUtemperature()))
cputemp = 9.0/5.0*temp1+32

currtime = strftime("%Y-%m-%d %H:%M:%S")

boottime = datetime.datetime.fromtimestamp(psutil.boot_time()).strftime("%Y-%m-%d %H:%M:%S")

topic = "rbp2_catfeeder/systemstatus"

cpupercent = psutil.cpu_percent(interval=1)
vmem = psutil.virtual_memory().percent
diskusage =  psutil.disk_usage('/').percent


payload = { 'datetimedatacollected': currtime, 'cpuusage': cpupercent, 'boottime': boottime, 'virtualmem': vmem, 'diskusage': diskusage, 'cputemp': cputemp }

mqtthost = <redacted mqtt broker address>
mqttuser = <redacted mqtt user name>
mqttpwd = <redacted mqtt user password>

client = mqtt.Client()
client.username_pw_set(mqttuser, mqttpwd)
client.connect(mqtthost, 1883, 60)

payload_json = json.dumps(payload)

print (payload_json)

persistant_data = True

client.publish(topic, payload_json, 0, persistant_data)
client.disconnect()

sys.exit()