let serverlist = await minetestServerlist({
	bindAddr: [26537, '172.17.0.1']
});

return {
	services: {
		mintest: minetestDockerService({
			container: 'minetest',
			serverlist,
			bindAddr: [30000],
			upstreamAddr: [31000, '127.0.0.1'],
		}),
		custom: {
			ports: [
				{
					type: 'tcp', // or 'udp'
					bindAddr: [3532],
					upstreamAddr: [3535, '127.0.0.1'],
					async function* filter(inp, dir, conn) {
						// dir in {'client->server':1, 'server->client':1}
						for await (let chunk of inp) {
							yield chunk;
						}
					},
					async function preread(opt) {
						await opt.recv();
						// do something ig maybe opt.send() some data to client
						return true; // wake up the service;
						// return false will not do this and will close the connection instead
					}
					// // only if ^^^ not defined
					// async function* filterUpstream(inp, conn) {}
					// async function* filterClient(inp, conn) {}
				}
			],
			powerOn: async function() {},
			powerOff: async function() {},
		}
	}
}