add mosquitto and nodemcu

content/posts/deluge-change-useragent.rst

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+Change Deluge User-Agent
+########################
+:date: 2015-04-28
+:tags: deluge,user-agent,switch
+
+For some torrents bittorrent peers seem to refuse sharing with my deluge
+daemon because it had the wrong 'user-agent' (read: Discrimination).
+
+Fortunately, on the internet nobody knows you are a dog. As long as we show
+the correct name-tag and provide some basic features we will be good to go::
+
+  vim $(find / -path '*deluge/core/core.py' )
+
+Now, change the following lines:
+
+.. code-block:: diff
+
+    90c90                                                                          
+    <         self.session = lt.session(lt.fingerprint("DE", *version), flags=1)
+    ---
+    >         self.session = lt.session(lt.fingerprint("UT", 3, 3, 1, 0), flags=1)
+    97c97
+    <         self.settings.user_agent = "Deluge %s" % deluge.common.get_version()
+    ---
+    >         self.settings.user_agent = "uTorrent/3310(30017)"

content/posts/mosquitto-and-nodemcu.md

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+title: MQTT and Nodemcu 
+date: 2015-07-04 18:00
+tags: nodemcu,mqtt,archlinux,graphite
+
+This blog should provide a technical walkthrough to get an mqtt environment
+running. It connects an [ESP8266 Microcontroller](http://s.click.aliexpress.com/e/qjiYvjiQb?af=130085010) uC to the MQTT server and transfers the messages
+into graphite messages
+
+## Install Mosquitto on arch
+
+```bash
+user: gpg --recv-keys 779B22DFB3E717B7
+# use "keyserver http://http-keys.gnupg.net" if --recv-keys didn't work
+user: yaourt mosquitto
+root: echo user mosqitto >> /etc/mosquitto/mosquitto.conf
+root: systemctl start mosquitto
+```
+
+## ESP8266 uC
+With nodemcu on the most current version (as of 2015-07-04)  of nodemcu and upload:
+
+```lua
+-- connect to wifi
+ident="123211"
+m = mqtt.Client(ident,120)
+mqtt_host="10.0.0.1"
+mqtt_port=1883
+m:connect(mqtt_host,mqtt_port,0,function(conn)
+    print("connected")
+end)
+
+function send_temperature()
+    status,temp,humi,temp_decimial,humi_decimial = dht.read(4)
+    m:publish(string.format("/temperature/%s",ident),string.format("%.2f",temp),0,0)
+    m:publish(string.format("/humidity/%s",ident),string.format("%.2f",humi),0,0)
+end
+tmr.stop(1)
+tmr.alarm(1,1000,1,send_temperature)
+```
+
+## Python mqtt Subscriber
+Subscribes temperature and humidity infos and sends it to graphite
+```python
+#!/usr/bin/env python
+# pip install paho-mqtt
+import paho.mqtt.client as mqtt
+graphite_host='heidi.shack'
+def on_connect(client, userdata, flags, rc):
+    print("Connected with result code " + str(rc))
+
+    client.subscribe("/temperature/#")
+    client.subscribe("/humidity/#")
+
+
+import socket
+def to_graphite(path,data,ts=None,host='localhost',port=2003):
+    if not ts: ts = datetime.now().timestamp()
+    sock = socket.socket()
+    data="{} {} {}\n".format(path,data,ts)
+    try:
+        sock.connect((host, port))
+        sock.sendall(data.encode())
+        sock.close()
+        print("sent '{}'".format(data.strip()))
+    except Exception as e:
+        print(e)
+        print("cannot send message '{}'".format(data))
+
+def on_message(client, userdata, msg):
+    t = msg.topic
+    print(msg.topic + " " + str(msg.payload))
+    if t.startswith('/temperature') or t.startswith('/humidity'):
+        typ=t.split('/')[1]
+        ident=t.split('/')[-1]
+        to_graphite("sensors.temp.id.{}.{}".format(ident,typ),float(msg.payload),int(msg.timestamp),host=graphite_host)
+
+client = mqtt.Client()
+client.on_connect = on_connect
+client.on_message = on_message
+
+client.connect("heidi.shack", 1883, 60)
+
+client.loop_forever()
+```