Hi,

having some rare issues writing acc-data to a remote MySQL server. The connection is made using the MySQL SSL options. Most, 99,9%, of the writes work well.

The error is:

Nov 20 13:48:55 /usr/sbin/kamailio[28976]: WARNING: db_mysql [km_dbase.c:84]: db_mysql_submit_query(): driver error on ping: SSL connection error: socket layer receive error
Nov 20 13:48:55 /usr/sbin/kamailio[28976]: ERROR: db_mysql [km_dbase.c:121]: db_mysql_submit_query(): driver error on query: SSL connection error: socket layer receive error
Nov 20 13:48:55 /usr/sbin/kamailio[28976]: ERROR: <core> [db_query.c:235]: db_do_insert_cmd(): error while submitting query

Apart from the connection details (using [mysql-ssl-conf] for the SSL config block) I have this config:

modparam("db_mysql", "ping_interval", 30);
modparam("db_mysql", "timeout_interval", 8);

The documentation suggests that "ping_interval" is the "Time interval in seconds to send ping messages to MySQL server in order to keep the connection open." However, looking at the code this seems a bit misleading because it looks like the ping is only done on an actual query (db_mysql_submit_query), i.e. not with a regular interval/on a timer as suggested by the documentation?

Also the "auto_reconnect" parameter is stated as default 1 (on), but in the code this is just used as a "retry" of the query itself and MYSQL_OPT_RECONNECT is never set on the connection (https://dev.mysql.com/doc/refman/5.5/en/auto-reconnect.html)? Maybe this is not necessary and it's enough to just re-try the query?

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