server.properties

Basic settings, read on start. Defaults below are what a new server writes.

Key	Default	Description
motd	PocketMine-MP Server	Name shown in the server list.
server-ip	0.0.0.0	IPv4 address to listen on.
server-port	19132	Game port. NetherNet uses it in TCP (signaling) and UDP (game data); RakNet and Query use UDP.
server-ipv6 / server-portv6	:: / 19133	IPv6 address and port.
enable-ipv6	true	Listen on IPv6 too.
enable-nethernet	true	NetherNet (WebRTC), required by Bedrock 1.26.50 and newer.
enable-raknet	true	RakNet, used by older clients.
nethernet-udp-port	0	NetherNet game data on its own UDP port; 0 = server-port.
white-list	false	Only players in white-list.txt can join.
max-players	20	Player limit.
gamemode	SURVIVAL	Default game mode: SURVIVAL, CREATIVE, ADVENTURE, SPECTATOR.
force-gamemode	false	Put players in the default game mode every time they join.
hardcore	false	Banned on death.
pvp	true	Players can hurt each other.
difficulty	2	0 peaceful, 1 easy, 2 normal, 3 hard.
level-name	world	Default world (folder in worlds/).
level-seed	(random)	Seed for the default world when it is created.
level-type	vanilla	Generator for new worlds: vanilla, normal, flat, nether, the_end…
generator-settings		Extra options for the generator (e.g. flat world layers).
enable-query	true	Answer GameSpy4 Query (server lists, status sites).
auto-save	true	Save worlds periodically.
view-distance	16	Maximum view distance in chunks.
xbox-auth	true	Require Xbox Live login. Keep it on unless the server is behind VanillaGate, which checks logins itself.
language	eng	Server language (console, messages). Players can get messages in their own language: see settings.per-player-language in pocketmine.yml.

Command line

Any key can be set at start: ./start.sh --server-port=19140 --motd="Test".