Network protocol constants
ADDRESS_ALIVE
address is online if online less than this many seconds ago
MAX_ADDR_COUNT
protocol specification says max 1000 addresses in one addr command
MAX_MESSAGE_SIZE
~1.6 MB which is the maximum possible size of an inv message.
MAX_OBJECT_PAYLOAD_SIZE
2**18 = 256kB is the maximum size of an object payload
MAX_OBJECT_COUNT
protocol specification says max 50000 objects in one inv command
MAX_TIME_OFFSET
maximum time offset