Take a look at the skynet basic directory first, as shown below, the sample with skynet is in the examples path

Click in to see config. The following figure shows the configuration information.

The main function of the skynet-src/skynet_main.c script is called here as follows

Start up sample first.
Open the terminal cd to the skynet directory and execute the next line of commands in that directory

cd ../skynet/

Execute the next command

./skynet examples/config

After completion, the following figure is shown as Server start

Then re-open a terminal and re-enter the skynet directory, and execute the following two commands in turn

cd ../skynet/

3rd/lua/lua_examples/client.lua

As shown in the figure below, the helloworld client in the sample starts, and you can see that the service sends a heartbeat packet every five seconds.

If you want to close the server, just Ctrl+C.

Look at the client.lua script again

package.cpath = "luaclib/?.so"

local socket = require "client.socket"
local crypt = require "client.crypt"

if _VERSION ~= "Lua 5.3" then
	error "Use lua 5.3"
end

local fd = assert(socket.connect("127.0.0.1", 8001))

local function writeline(fd, text)
	socket.send(fd, text .. "\n")
end

local function unpack_line(text)
	local from = text:find("\n", 1, true)
	if from then
		return text:sub(1, from-1), text:sub(from+1)
	end
	return nil, text
end

local last = ""

local function unpack_f(f)
	local function try_recv(fd, last)
		local result
		result, last = f(last)
		if result then
			return result, last
		end
		local r = socket.recv(fd)
		if not r then
			return nil, last
		end
		if r == "" then
			error "Server closed"
		end
		return f(last .. r)
	end

	return function()
		while true do
			local result
			result, last = try_recv(fd, last)
			if result then
				return result
			end
			socket.usleep(100)
		end
	end
end

local readline = unpack_f(unpack_line)

local challenge = crypt.base64decode(readline())

local clientkey = crypt.randomkey()
writeline(fd, crypt.base64encode(crypt.dhexchange(clientkey)))
local secret = crypt.dhsecret(crypt.base64decode(readline()), clientkey)

print("sceret is ", crypt.hexencode(secret))

local hmac = crypt.hmac64(challenge, secret)
writeline(fd, crypt.base64encode(hmac))

local token = {
	server = "sample",
	user = "hello",
	pass = "password",
}

local function encode_token(token)
	return string.format("%s@%s:%s",
		crypt.base64encode(token.user),
		crypt.base64encode(token.server),
		crypt.base64encode(token.pass))
end

local etoken = crypt.desencode(secret, encode_token(token))
local b = crypt.base64encode(etoken)
writeline(fd, crypt.base64encode(etoken))

local result = readline()
print(result)
local code = tonumber(string.sub(result, 1, 3))
assert(code == 200)
socket.close(fd)

local subid = crypt.base64decode(string.sub(result, 5))

print("login ok, subid=", subid)

----- connect to game server

local function send_request(v, session)
	local size = #v + 4
	local package = string.pack(">I2", size)..v..string.pack(">I4", session)
	socket.send(fd, package)
	return v, session
end

local function recv_response(v)
	local size = #v - 5
	local content, ok, session = string.unpack("c"..tostring(size).."B>I4", v)
	return ok ~=0 , content, session
end

local function unpack_package(text)
	local size = #text
	if size < 2 then
		return nil, text
	end
	local s = text:byte(1) * 256 + text:byte(2)
	if size < s+2 then
		return nil, text
	end

	return text:sub(3,2+s), text:sub(3+s)
end

local readpackage = unpack_f(unpack_package)

local function send_package(fd, pack)
	local package = string.pack(">s2", pack)
	socket.send(fd, package)
end

local text = "echo"
local index = 1

print("connect")
fd = assert(socket.connect("127.0.0.1", 8888))
last = ""

local handshake = string.format("%s@%s#%s:%d", crypt.base64encode(token.user), crypt.base64encode(token.server),crypt.base64encode(subid) , index)
local hmac = crypt.hmac64(crypt.hashkey(handshake), secret)


send_package(fd, handshake .. ":" .. crypt.base64encode(hmac))

print(readpackage())
print("===>",send_request(text,0))
-- don't recv response
-- print("<===",recv_response(readpackage()))

print("disconnect")
socket.close(fd)

index = index + 1

print("connect again")
fd = assert(socket.connect("127.0.0.1", 8888))
last = ""

local handshake = string.format("%s@%s#%s:%d", crypt.base64encode(token.user), crypt.base64encode(token.server),crypt.base64encode(subid) , index)
local hmac = crypt.hmac64(crypt.hashkey(handshake), secret)

send_package(fd, handshake .. ":" .. crypt.base64encode(hmac))

print(readpackage())
print("===>",send_request("fake",0))	-- request again (use last session 0, so the request message is fake)
print("===>",send_request("again",1))	-- request again (use new session)
print("<===",recv_response(readpackage()))
print("<===",recv_response(readpackage()))


print("disconnect")
socket.close(fd)

pause