[DISCUSSION] F1® 25 UDP SPECIFICATION

As last year, I put here the delta between 24 & 25, for information, please feel free to comment things I missed/misunderstood :)

• A new packet id:

ePacketIdLapPositions = 15, // Lap positions on each lap so a chart can be constructed

• A new packet type (with the packet it above, obviously)

The lap positions data indicates which position each car was on at the start of each lap. Using this
information a lap positions chart can be constructed. Note that only a maximum of 50 laps will be
transmitted in a packet. If more than 50 laps have occurred then two packets will be transmitted, with
different m_lapStart parameters. The whole lap position history can be recreated merging both of
these.
Frequency: 1 per second
Size: 1131 bytes
Version: 1

struct PacketLapPositionsData { PacketHeader m_header; // Header // Packet specific data uint8 m_numLaps; // Number of laps in the data uint8 m_lapStart; // Index of the lap where the data starts, 0 indexed // Array holding the position of the car in a given lap, 0 if no record uint8 m_positionForVehicleIdx[50][cs_maxNumCarsInUDPData]; };

• On Retirement event, reason added :

uint8 reason; // Result reason - 0 = invalid, 1 = retired, 2 = finished, 3 = terminal damage // 4 = inactive, 5 = not enough laps completed, 6 = black flagged, 7 = red flagged // 8 = mechanical failure, 9 = session skipped, 10 = session simulated

• New event "DRSDisabled", containing the reason :

NEuint8 reason; // 0 = Wet track, 1 = Safety car deployed, 2 = Red flag, 3 = Min lap not reached

• In event "StopGoPenaltyServer", added the stop time :

float stopTime; // Time spent serving stop go in seconds

• Participant's name max length goes from 48 to 32 (size goes from 1350 to 1284 bytes)
• Participant data now includes information about the livrery :

// RGB value of a colour struct LiveryColour { uint8 red; uint8 green; uint8 blue; }; (...) uint8 m_numColours; // Number of colours valid for this carLiveryColour m_liveryColours[4]; // Colours for the car (...)

• In CarStatusData, C6 tyre are now available in actualTyreCompound as value 22
• FinalClassificationData now includes resultReason field (growing the bytes size of the packet from 1020 to 1042 bytes)

uint8 m_resultReason; // Result reason - 0 = invalid, 1 = retired, 2 = finished, 3 = terminal damage // 4 = inactive, 5 = not enough laps completed, 6 = black flagged, 7 = red flagged // 8 = mechanical failure, 9 = session skipped, 10 = session simulated

• In LobbyInfoData, name goes from 48 to 32 chars length, dropping packet size from 1306 bytes to 954 bytes
• In CarDamage Packet, added tyreBlisters field (packet size goes from 953 to 1041 bytes)

uint8 m_tyreBlisters[4]; // Tyre blisters value (percentage)

• In PacketMotionExData, added 3 new fields (size goes from 237 to 273 bytes)

float m_chassisPitch; // Pitch angle of the chassis relative to the direction of motion - radians
float m_wheelCamber[4]; // Camber of each wheel in radians
float m_wheelCamberGain[4]; // Camber gain for each wheel in radians, difference between active camber and dynamic camber