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BS1400 Messenger to a webserver
Introduction
The BS1400 LAN base station for the Arexx Multilogger system has built-
in messenger functionality. With the messenger it is possible source http
requests to external web servers by the base station. The http requests are
used to transport measurement data to a database via a script based web
service like MySQL/Apache or Microsoft's SQLServer/asp.net. The messenger
applies given rules for each incoming measurement. A rule is an action that
is executed as soon as its accompanying condition is met. Rules are com-
posed by the Rule Editor tool, and the resulting rule file is uploaded to the
BS1400 were it becomes active immediately after upload. The rule action can
be an email message, a HTTP request or turning on the built-in buzzer.
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Here we focus on the HTTP requests.
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HTTP request
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The HTTP request contains the following data:
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Request type: POST or GET
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URL: the URL of the web service, a port number can be added to
this URL, separated by a colon.
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Request data: a user defined string that contains the actual data.
This string is base64 encoded.
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When the HTTP request type is POST, the request data string is added to the
http request, when the request type is GET, the request data string is appen-
ded to the URL separated by the '?' character. On the server side the chosen
request method defines how the data is extracted.
The request data string is composed by the BS1400 to contain actual measu-
rement data by the given request data string. Data tags (starting with the '$'
character) are replaced by the actual data, like measurement value, sensor
id etc. The resulting string is base64 encoded thereafter, and sent to the web
server as a HTTP request. The following data tags can be used:
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