client -> server

• 0x6e697863 :: Int (hardcoded, 'nixc' in ASCII)

server -> client

• 0x6478696f :: Int (hardcoded, 'dxio' in ASCII)
• protocolVersion :: Int

client -> server

• clientVersion :: Int

If clientVersion is 1.14 or later

• sendCpu :: Bool (hardcoded to false in client)

If sendCpu is true

• cpuAffinity :: Int (obsolete and ignored)

If clientVersion is 1.11 or later

• reserveSpace :: Bool (obsolete, ignored and set to false)

server -> client

If clientVersion is 1.33 or later

• nixVersion :: String

If clientVersion is 1.35 or later

• trusted :: OptTrusted

server -> client

• send logs
• operation :: Int