This assignment has been performed at location and commissioned by Attendit

AB in Jönköping. The task has been to develop a client/server system to access

data stored in SQL databases where the client application is developed to run on

regular cellular telephones. The importance has been to develop as reliable mobile

communication as possible. The functionality that is demanded upon the mobile

communication is:

• Secured for future versions

• Interoperability

• Data should not be bugged, modified or disappear

unnoticed

• Resource efficient

We have achieved these demands by developing our own protocol that is on top of

the TCP protocol. The difficulty with the development has been to take in mind

the limited resources of the mobile phones regarding storage, memory and CPU.

The result of this task is a working system with a belonging database which has

stable mobile communication as foundation. Server and client is well structure so

the system easy can be extended with new different calls to the database.

In hence of confidentiality the real system is not presented in this report. Instead

we will describe fictitious scenario to exemplify the resolutions to the problems

that we have identified.