ALTER TABLE `properties` CHANGE `key` `pkey` VARCHAR( 255 ) CHARACTER SET latin1 COLLATE latin1_swedish_ci NOT NULL

You may encounter this error if you created the database and the database user manually, but forgot to create the tables before adding the demo values.

To create the tables, see https://github.com/volkszaehler/volkszaehler.org/tree/master/misc/sql.

falls beim Middleware Server unter apache in der access_log die Einträge in der folgenden Art gelistet sind:

<IP> - - [<DATE>] "POST /middleware/index.php/data/<UUID>.json?ts=0000&value=1 HTTP/1.1" 400 232

fehlt der TIMESTAMP des controllers (ts=0000).
In diesem Fall kann man Diesen testweise auch durch den Server erzeugen lassen, indem man ethersex (e6) ohne timestamp konfiguriert:

make menuconfig
  Applications:
    watchasync service:
      Include unix timestamp: ausschalten
      Summarize Events: ausschalten
      Path at the end: ".json"

By using several higher resolution power meters with an S0 interface (DIN 43864) and an above average power consumption the harddisc space required by the (mysql-)database and apaches access_log can grow rapidaly to several hundert megabytes.

Since MySQL writes every change additionally to a binary log file (e.g. mysqld-bin.<nnnnnn>), its space requirements can be lowered by limiting the maximum size of these files and auto deleting older ones e.g. by inserting the following entries in /etc/mysql/my.cnf:

[mysqld]
expire_log_days = 7
max_binlog_size = 10M

This always creates an new binlog file when its size exceeds 10MB and deletes the ones which are older than 7 days.

Another major size reduction can be reached by frequently rotating apaches access_log file e.g. with logrotate.

In future we hope to reduce the database size additionaly by e.g. optionaly offering the implementation of a round-robin database like RRDtool

Nach Aktualisierung eures Volkszählers durch „git pull“ muss euer Webserver „etc/init.d/apache2 restart“ neu gestartet werden.

Hier fehlt euch der PDO Datenbanktreiber. In der volkszaehler.conf.php habt ihr den verwendeten Treiber konfiguriert. Dazu müsst ihr ihn in der php.ini laden:

extension=pdo_mysql.so

Error message: „Parse error: syntax error, unexpected T_STRING, expecting T_CONSTANT_ENCAPSED_STRING or '(' in <filename>.php on line <line_number>“ reason: You're running php in a version < 5.3; verify by running „php -v“; result should begin with „PHP 5.3.“ or higher; solution: upgrade to 5.3.x or higher

The parameter $config['lib']['doctrine'] could be missing in volkszaehler.conf.php. Insert something like this (taken from the current template volkszaehler.template.conf.php):

$config['lib']['doctrine']			= VZ_DIR . '/lib/vendor/Doctrine';

A couple of hints for people trying to get this running under Gentoo:

- Profile: hardened/linux/x86
- make.conf: USE="logrotate unicode userlocales -X -tcpd"
- package.use: "dev-lang/php apache2 gd mysql pdo"
- "emerge git jpgraph mysql pecl-apc phpmyadmin"

AVR Compiler:
see http://en.gentoo-wiki.com/wiki/Crossdev#AVR_Architecture

- "emerge crossdev"
- "crossdev -v --target avr --gcc 4.4.4-r2 --binutils 2.20.1-r1 --libc 1.6.8 -s1 --without-headers"
- "crossdev -v --target avr --gcc 4.4.4-r2 --binutils 2.20.1-r1 --libc 1.6.8"
- "ln -s /usr/i686-pc-linux-gnu/avr/lib/ldscripts /usr/avr/lib/ldscripts"