Difference between revisions of "Add-On Services/en"

Revision as of 17:02, 1 June 2013

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Web server of Meteobridge client, which presents web interface for adminstration to you, can also deliver weather data. There are three URLs defined that can be polled to get most recent sensor data in a standard XML or plain text format or in user-defined format. Although we don't recommend this for security reasons, you can make that URLs accessible from the Internet by configuring your router appropriately. However, when you want to bring sensor data to one of your own servers in the Internet we recommend to make use of Meteobridge's Push Services, which will not need you to open up your firewall. Remark: In order to reach these HTTP services you need to handle basic authentification by adding "<username>:<password>@" in front of the URL.

Live Data as XML

By sending the meteobridge a HTTP request like "http://ip-of-meteobridge/cgi-bin/livedataxml.cgi" (where "ip-of-meteobridge" must be replaced by the IP itself) meteobridge returns current weather data in XML notation. Each reply starts witch tag <logger> and ends with </logger> with the sensor data as records with sensor specific tags "THB", "TH", "WIND", "RAIN", "UV", "SOLAR". Example below illustrates the XML format:

<logger>
  <THB date="20121227224318" id="thb0" temp="26.0" hum="37" dew="10.2" 
       press="1008.8" seapress="1010.1" fc="2"/>
  <TH date="20130104141909" id="th0" temp="9.1" hum="95" dew="8.3"/>
  <RAIN date="20130104141856" id="rain0" rate="0.0" total="3.0" delta="0.0"/>
  <WIND date="20130104141916" id="wind0" dir="109" gust="0.9" wind="2.2" chill="9.1"/>
</logger>

Each sensor data record has a mandatory "date" and "id" parameter. The other parameters are sensor specific. Meaning of parameters is:

• date: UTC timestamp of reception of sensor data in format "YYYYMMDDhhmmss"
• id: Unique ID of sensor, consists of a sensor type description shortcut followed by a number, which is always "0" in Meteobridge, as additional sensors are not supported
• temp: temperature in degrees Celsius (with one decimal)
• hum: relative humidity in percent (no decimals)
• dew: dew point temperature in degrees Celsius (with one decimal)
• press: station pressure (without altitude correction) in hPa (with one decimal)
• seapress: normalized pressure with altitude correction (also called sea level pressure) in hPa (with one decimal)
• fc: stations forecast code, if provided. As this has low evidence and also largely varies between stations, meteobridge does not recommend to make use of this data.
• rate: measured rain rate in mm per hour (with one decimal).
• total: current value of rain bucket counter, converted to mm (with one decimal).
• delta: additional rain fall in mm since previous readout of this data (with one decimal).
• wind: current average wind speed im m/s (with one decimal).
• gust: curent not avergaed wind speed in m/s (with one decimal).
• dir: wind direction in degrees (0-359, no decimals).
• chill: wind chill temperature in degrees Celsius (with one decimal).
• more to come...

Live Data as Plain Text

By sending the meteobridge a HTTP request like "http://ip-of-meteobridge/cgi-bin/livedata.cgi" (where "ip-of-meteobridge" must be replaced by the IP itself) meteobridge returns current weather data as plain text. Each reply consists of a series of lines, where each line represnets a sensor. Lines do start with a time stamp and a unique sensor id followed by sensor specific parameters. Example below illustrates the format:

20130104142614 thb0 26.9 38 11.4 1020.4 1021.7 2
20130104142610 rain0 0.0 3.0 0.0
20130104142636 th0 9.1 95 8.3
20130104142652 wind0 160 2.2 1.8 8.0

Live-Daten über eine Socket-Verbindung

Bei den oben angegebenen Verfahren wird eine HTTP-Authentifizierung wie für das gesammte Meteobridge Web-Interface benötigt. Wenn man sich das Skript "livedataxml.cgi" ansieht, kann man erkennen, dass dieses ledglich Daten vom Port 5557 liest, mit einem HTTP-Header versieht und dann an den anfragenden Browser ausliefert:

#!/bin/sh
echo -ne "Content-type: text/xml; charset=UTF-8\n\n"
nc 127.0.0.1 5557 2>/dev/null

Im Ergebnis entspricht ein Auslesen des Ports 5557 dem Aufruf von "livedataxml.cgi" und eine Abfrage von Port 5556 dem Skript "livedata.cgi".

Template-basierende individuelle Daten

Der vorangegangenen Skripte liefern Daten in einem Standardformat aus. Unter Verweundung des Meteobridge-Template-Mechanismus, der auch hier im Wiki beschriebven ist, kann mit dem Skript "template.cgi" eine angepasste Ausgabe von Meteobridge-Variablen in Form eines mit Daten gefüllten Templates erreicht werden.

Das Skript wird mit der URL "http://ip-of-meteobridge/cgi-bin/template.cgi" aufgerufen. Dabei ist das zu füllendenTemplate als Parameter in der Form "template=DEIN_TEMPLATE_TEXT" mitzugeben. Als optionaler Parameter kann der in der HTTP-Antwort zu verwendende Content-Type mitgegeben über "contenttype=CONTENT_TYPE" mitgegeben werden. Beide Parameter müssen URL-encoded übergeben werden, wobei Sonderzeichen als "%XX" (XX ist der zweistellige Hexadezimalkode) und Leerzeichen als "+" zu spezifizieren sind.

http://ip-of-meteobridge/cgi-bin/template.cgi?template=[DD].[MM].[YY]+[HH]:[mm][APM]%0D[th0temp-act]%BAC%0d[th0hum-act]%25&contenttype=text/plain;charset=iso-8859-1

01.06.13 04:55PM
23.2ºC
61.0%