= Wialon IPS

The Wialon IPS (v. 2.0) communication protocol was developed by Gurtam for use in personal and automotive GPS and GLONASS trackers which transfer data to a satellite monitoring server using the TCP or the UDP protocol.

== TCP Data Transfer The TCP connection must be maintained throughout the entire data transfer process. If the device disconnects immediately after sending the message, the server does not have time to send a response to the device, and traffic consumption increases. While using one TCP connection, you should transfer data from one device. Otherwise, the system registers only the data of the device whose ID is the first in the incoming data list. To save traffic, you can use the UDP protocol. However, it does not guarantee that the messages will be delivered.

.Packet Types [%autowidth] |=== | Type | Description | Sender | Decoder | Encoder | L | Login packet | Device | Y | N | AL | Answer to the login packet | Server | N | N | SD | Short data packet | Device | Y | N | ASD | Answer to the short data packet | Server | N | N | D | Extended data packet | Device | Y | N | AD | Answer to the extended data packet | Server | N | N | B | Black box packet | Device | Y | N | AB | Answer to the black box packet | Server | N | N | P | Ping packet | Device | N | N | AP | Answer to the ping packet | Server | N | N | US | Firmware packet | Server | N | N | UC | Configuration packet | Server | N | N | M | Message to/from the driver | Server/Device | N | N | AM | Answer to the message from the driver | Server | N | N | QI | Query snapshot command | Server | N | N | I | Snapshot packet | Device | N | N | AI | Answer to the snapshot packet | Server | N | N | QT | Query DDD file command | Server | N | N | IT | DDD file information packet | Device | N | N | AIT | Answer to the DDD file information packet | Server | N | N | T | DDD file block packet | Device | N | N | AT | Answer to the DDD file block packet | Server | N | N |===

== UDP Data Transfer (not implemented yet) The UDP protocol is used only to transfer data from the controller to the server. It is not possible to send commands from the server to the device using this protocol.

== Data Compression (not implemented yet) To save traffic, it is appropriate to use data compression while transferring packets which contain a large amount of data. The DEFLATE algorithm of the cross-platform «z lib» library is used for compression. Both TCP and UDP transport protocols are supported. The container should consist of only one packet in text format.