Wednesday, February 18, 2015

Web interface - log

One of the important pages provided by the embedded web server is a log. It translates various system messages to meaningful text(at least for me :). The table is showing 20 entries at once and you can list through them by buttons << and >>. Button "now" will take you to the most recent message. As you can see on the left, there is numeric id of the message, time stamp, the message text and status of the SMS function. Above the table is a button to clear all the log table, but it takes a while.

Physically the log is located in 512kb I2C controlled EEPROM, and the logging mechanism using 16 bytes for every event. This makes together maximum number of 4096 log messages stored. Any call to log message  function pushes the message to FIFO along with actual time stamp. Then there is a logger thread that takes care about the EEPROM circular buffer, and also about the SMS. Every message can be send as SMS to appropriate group of people.

The message itself looks like this:


As you can deduce the "15 02 18" is date, "10 41 45" is time, next is the status of SMS function:
  • "." requested, failed
  • "," not requested, failed
  • ";" not requested, acknowledged
  • "|" not connected
  • ":" sent
And last 3 characters is the message itself, well not actually, but it is its acronym or code. SCW is "System configuration saved, by pressing button on web interface". All these are decoded by web server and SMS function. You can look for more in code.

Logger thread also pushes all messages into following MQTT topics:

OHS/Log 150218104158;SCW

I'm planning to create on/off button for MQTT push.

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