Here is a list of packets seen from a collect around Feb 2009 to show the order of packets between the client and the server when logging in. Adding this here for reference in case we want to investigate any of the unknowns.
Code:
[OPCode: 0x3594] [Decoded] [Client->Server] [Size: 4] - OP_AckPacket
[OPCode: 0x5a6b] [Decoded] [Client->Server] [Size: 68] - OP_ZoneEntry
[OPCode: 0x1af0] [Decoded] [Server->Client] [Size: 12] - Unknown/New???
[OPCode: 0x3bef] [Decoded] [Server->Client] [Size: 0] - OP_RespondAA
[OPCode: 0x322f] [Decoded] [Server->Client] [Size: 120] - OP_SendAATable
[OPCode: 0x6022] [Decoded] [Server->Client] [Size: 23488] - OP_PlayerProfile
[OPCode: 0x5a6b] [Decoded] [Server->Client] [Size: 334] - OP_ZoneEntry
[OPCode: 0x6015] [Decoded] [Server->Client] [Size: 8] - OP_TimeOfDay
[OPCode: 0x399b] [Decoded] [Server->Client] [Size: 48] - OP_TributeUpdate
[OPCode: 0x4036] [Decoded] [Client->Server] [Size: 4] - Unknown/New???
[OPCode: 0x3594] [Decoded] [Client->Server] [Size: 4] - OP_AckPacket
[OPCode: 0x709d] [Decoded] [Server->Client] [Size: 205802] - OP_CharInventory
[OPCode: 0x5412] [Decoded] [Server->Client] [Size: 4] - OP_CompletedTasks
[OPCode: 0x2641] [Decoded] [Server->Client] [Size: 12] - OP_Weather
[OPCode: 0x4292] [Decoded] [Server->Client] [Size: 4] - OP_DeleteSpawn or Unknown/New???
[OPCode: 0x6c26] [Decoded] [Server->Client] [Size: 4] - Unknown/New???
[OPCode: 0x2c4c] [Decoded] [Server->Client] [Size: 24] - OP_WorldUnknown001
[OPCode: 0x0924] [Decoded] [Client->Server] [Size: 1] - Unknown/New???
[OPCode: 0x43ac] [Decoded] [Client->Server] [Size: 0] - OP_ReqNewZone
[OPCode: 0x466c] [Decoded] [Client->Server] [Size: 0] - OP_UpdateAA
[OPCode: 0x116d] [Decoded] [Server->Client] [Size: 20] - Unknown/New???
[OPCode: 0x5ca5] [Decoded] [Server->Client] [Size: 932] - OP_NewZone
[OPCode: 0x1b26] [Decoded] [Server->Client] [Size: 921] - OP_CustomTitles
[OPCode: 0x7bbb] [Decoded] [Client->Server] [Size: 4] - OP_TargetMouse
[OPCode: 0x3594] [Decoded] [Client->Server] [Size: 4] - OP_AckPacket
[OPCode: 0x1436] [Decoded] [Client->Server] [Size: 0] - OP_ReqClientSpawn
[OPCode: 0x102f] [Decoded] [Server->Client] [Size: 184] - OP_SpawnDoor
[OPCode: 0x5821] [Decoded] [Server->Client] [Size: 484] - OP_SendZonePoints
[OPCode: 0x69cd] [Decoded] [Server->Client] [Size: 0] - New OP_WorldObjectsSent (Replaced OP_SendExpZonein here)
[OPCode: 0x0baa] [Decoded] [Client->Server] [Size: 88] - OP_BlockedSpells
[OPCode: 0x7b73] [Decoded] [Client->Server] [Size: 0] - OP_WorldObjectSent
[OPCode: 0x10b7] [Decoded] [Server->Client] [Size: 8] - OP_SpawnAppearance
[OPCode: 0x3088] [Decoded] [Server->Client] [Size: 12] - OP_AAExpUpdate
[OPCode: 0x0e98] [Decoded] [Server->Client] [Size: 8] - OP_ExpUpdate
[OPCode: 0x50d0] [Decoded] [Server->Client] [Size: 12] - OP_AAAction
[OPCode: 0x7b73] [Decoded] [Server->Client] [Size: 0] - OP_WorldObjectSent
[OPCode: 0x7312] [Decoded] [Client->Server] [Size: 128] - OP_SetServerFilter
[OPCode: 0x4e4e] [Decoded] [Server->Client] [Size: 4704] - OP_VetRewardsAvailable
[OPCode: 0x5448] [Decoded] [Server->Client] [Size: 12] - OP_SimpleMessage
[OPCode: 0x435b] [Decoded] [Server->Client] [Size: 4] - Unknown/New???
[OPCode: 0x0296] [Decoded] [Server->Client] [Size: 4] - Unknown/New???
[OPCode: 0x5a6b] [Decoded] [Server->Client] [Size: 326] - OP_ZoneEntry
[OPCode: 0x3164] [Decoded] [Server->Client] [Size: 5] - OP_DeleteSpawn
[OPCode: 0x5ebc] [Decoded] [Server->Client] [Size: 12] - Unknown/New???
[OPCode: 0x2d17] [Decoded] [Client->Server] [Size: 8] - Unknown/New???
[OPCode: 0x6759] [Decoded] [Client->Server] [Size: 0] - OP_ClientReady
[OPCode: 0x7b6e] [Decoded] [Client->Server] [Size: 8] - OP_WeaponEquip2
[OPCode: 0x231f] [Decoded] [Client->Server] [Size: 19] - OP_WearChange
[OPCode: 0x4675] [Decoded] [Client->Server] [Size: 20] - OP_BazaarSearch
[OPCode: 0x19d2] [Decoded] [Client->Server] [Size: 0] - Unknown/New???
[OPCode: 0x4b49] [Decoded] [Client->Server] [Size: 4] - OP_Barter??? 0x6b0e?
[OPCode: 0x7eac] [Decoded] [Client->Server] [Size: 12] - Unknown/New???
[OPCode: 0x365d] [Decoded] [Client->Server] [Size: 4] - Unknown/New???
[OPCode: 0x266e] [Decoded] [Client->Server] [Size: 4] - Unknown/New???
[OPCode: 0x7eeb] [Decoded] [Client->Server] [Size: 0] - Unknown/New???
[OPCode: 0x27bf] [Decoded] [Client->Server] [Size: 8] - Unknown/New???
[OPCode: 0x7e31] [Decoded] [Client->Server] [Size: 4] - Unknown/New???
[OPCode: 0x2d37] [Decoded] [Client->Server] [Size: 4] - Unknown/New???
[OPCode: 0x32c6] [Decoded] [Server->Client] [Size: 140] - OP_RaidUpdate
[OPCode: 0xd677] [Decoded] [Server->Client] [Size: 648] - OP_GuildMOTD
[OPCode: 0x35d3] [Decoded] [Server->Client] [Size: 8] - Unknown/New???
[OPCode: 0x7b6e] [Decoded] [Server->Client] [Size: 8] - OP_WeaponEquip2
[OPCode: 0x7062] [Decoded] [Client->Server] [Size: 40] - OP_ClientUpdate
[OPCode: 0x7eeb] [Decoded] [Server->Client] [Size: 62] - Unknown/New??? - Looks like the EQPlayers update
[OPCode: 0x538f] [Decoded] [Server->Client] [Size: 10] - OP_HPUpdate
[OPCode: 0x4b61] [Decoded] [Server->Client] [Size: 10] - Unknown/New??? - Maybe new Mana Update
[OPCode: 0x02d6] [Decoded] [Server->Client] [Size: 10] - Unknown/New??? - Maybe new Endurance Update