Running mqtt python script in PHP bluemix container - php

Question

I am running a PHP code on docker container hosted in Bluemix. The PHP code calls a python script which is a MQTT based subscribe code. My idea was everytime the subscribed code gets MQTT message it will write the values to a text file. The PHP code will keep on checking every 10 seconds for new values in the file.
The VCAP_ENV variables are getting written correctly. However, the site does not load.
The python script executes successfully when i try it locally. So no errors there too.
My code is as follows:
PHP CODE:
<?php
if( getenv("VCAP_SERVICES") ) {
// get IoT service configuration from Bluemix
$services = getenv("VCAP_SERVICES");
$services_json = json_decode($services, true);
$mysql_config = $services_json["iotf-service"][0]["credentials"];
$org_id = $mysql_config["org"];
$port = $mysql_config["mqtt_u_port"];
$username = $mysql_config["apiKey"];
$password = $mysql_config["apiToken"];
}
// set configuration values
$config = array(
'org_id' => $org_id,
'port' => $port,
'app_id' => 'mymqttfinalservice',
'iotf_api_key' => $username,
'iotf_api_secret' => $password,
'device_id' => '007',
'qos' => 1
);
$file = fopen("VCAP_CONFIG.ini","w");
#fwrite($file,"[config]" . PHP_EOL );
#fwrite($file,"org =" . $org_id . PHP_EOL );
#fwrite($file,"apikey =" . $username . PHP_EOL );
#fwrite($file,"authkey =" . $password . PHP_EOL );
fwrite($file,"[config]" . "\n" );
fwrite($file,"org =" . $org_id . "\n" );
fwrite($file,"apikey =" . $username . "\n" );
fwrite($file,"authkey =" . $password . "\n" );
fclose($file);
$file = file_get_contents('VCAP_CONFIG.ini', true);
echo $file;
$command = 'chmod 777 /app/PythonSubscribeCode.py';
$output = '';
exec ( $command);
$command = 'python3 /app/PythonSubscribeCode.py 2>&1';
$output = exec ($command);
print_r($output);
$x = 1;
while($x == 1)
{
$config = parse_ini_file('Data.ini');
echo json_encode($config);
sleep(5);
}
?>
Python Script:
# -*- coding: utf-8 -*-
#!/usr/bin/env python3
import paho.mqtt.client as mqtt
import os, json
import time
import configparser
# This is the Subscriber
settings = configparser.ConfigParser()
settings.read('VCAP_CONFIG.ini')
organization = settings['config']['org']
username = settings['config']['apikey']
password = settings['config']['authkey']
#Set the variables for connecting to the iot service
broker = ""
devicename = "007"
topic = "iot-2/type/DesktopApplication/id/007/evt/status/fmt/json"
#topic = 'iot-2/evt/status/fmt/json'
deviceType = "DesktopApplication"
clientID = "a:" + organization + ":appId"
print (clientID)
broker = organization + ".messaging.internetofthings.ibmcloud.com"
mqttc = mqtt.Client(clientID)
if username is not "":
mqttc.username_pw_set(username, password=password)
def on_connect(client, userdata, flags, rc):
print("Connected with result code "+str(rc))
def on_subscribe(mosq, obj, mid, granted_qos):
print("Subscribed: " + str(mid) + " " + str(granted_qos))
def on_message(mosq, obj, msg):
global message
print(msg.topic + " " + str(msg.qos) + " " + str(msg.payload))
def on_message(client, userdata, msg):
writeData = msg.payload.decode('utf-8')
parsed_json = json.loads(writeData)
UDD = parsed_json['UDD']
DDD = parsed_json['DDD']
PH = parsed_json['PH']
Ignition = parsed_json['Ignition']
# add the settings to the structure of the file, and lets write it out...
config = configparser.ConfigParser()
config['Data'] = {'UDD': UDD,
'DDD': DDD,
'PH': PH,
'Ignition':Ignition}
with open('Data.ini', 'w') as configfile:
config.write(configfile)
mqttc.connect(host=broker, port=1883, keepalive=60)
test = mqttc.subscribe(topic,0)
#print (test)
mqttc.on_connect = on_connect
mqttc.on_subscribe = on_subscribe
mqttc.on_message = on_message
mqttc.loop_forever()
Can someone please guide on this?

Answer 1

Do you get any useful error messages from cf ic logs containerid to see what might be failing? As an alternate, you could also try execing into the container (either cf ic exec -ti containerid bash or docker exec...) and run the python script directly to see if that's giving you other errors when running there.