Hello,
Thank you for providing information about your issue.
All the data can be read from AVL packets sent using Codec protocol, if you wish to receive data with OBDII information you should set up your device in the configurator by selecting priority of your necessary available parameters. Priority can be selected none/low/high/panic, if none is selected on a certain parameter it will not be included in the AVL Data packet. If the OBDII data is generated you can read it by parsing the packet received in your server. Please see the link below to get all the information about Codecs used in data transmission:
https://wiki.teltonika.lt/view/Codec
For usual data transfer device uses CODEC 8, CODEC 12 should be used in order to send GPRS commands to the device.
This is the basic information provided for you,
If you wish to get more detailed information please specify, what issues you are having and how can we help you.
Best regards.