Python Code to retrieve data from Device to IBM Bluemix

Question

I need code for getting data from bluemix which is sent by this code

import RPi.GPIO as GPIO
import dht11
import time
import datetime
import ibmiotf.device

# initialize GPIO
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BCM)
GPIO.cleanup()

1
client.connect()



# read data using pin GPIO4
instance = dht11.DHT11(pin=4)

while True:
    result = instance.read()
    if result.is_valid():
        print("Last valid input: " + str(datetime.datetime.now()))
        temp=(" %d C" % result.temperature)
        print("temperature:" +temp)
        humid=("%d %%" % result.humidity)
    print("Humidity:" +humid)
       # print("Temperature: %d C" % result.temperature)
       # print("Humidity: %d %%" % result.humidity)
        print("Data is published into the cloued")
        Data={'Temperature' :temp, 'Humidity' :humid }
        client.publishEvent("status", "json", Data)

    time.sleep(1)

Answer 1

You connect as a device -> import ibmiotf.device. A device can send events and receive commands. It can't receive events. To do this you need to connect as an application. You will import ibmiotf.application and have something like:

options = ibmiotf.application.ParseConfigFile(configFilePath)
appClient = ibmiotf.application.Client(options)

appClient.connect()
appClient.subscribeToDeviceEvents()

The config file should be like:

[application]
org=orgId
id=myApplication
auth-method=apikey
auth-key=key
auth-token=token

Where the auth-key/auth-token comes from the Apps part of your platform. You'll have to generate a set to connect as an application. The auth-method should be left as apikey.

That will list every event that arrives to your platform. You can make it more granular.