Add ability to exchange private messages between minetest servers

README.md

@@ -92,11 +92,17 @@ callback: Callback function (params: srvs)
 Description: Returns an indexed table containing all server names
 to the callback function
 ```
-> `multiserver.send_msg(msg)`
+> `multiserver.broadcast_msg(msg)`
 ```
 msg: Message to send
 Description: Sends a message to all other minetest servers
 ```
+> `multiserver.send_msg(tosrv, msg)`
+```
+tosrv: Server to send the message to
+msg: Message to send
+Description: Sends a message to another minetest server
+```
 > `multiserver.register_on_joinplayer(callback)`
 ```
 callback: Callback function (params: name, srv)
@@ -116,7 +122,8 @@ indicates whether the redirection was successful
 ```
 > `multiserver.register_on_msg(callback)`
 ```
-callback: Callback function (params: msg)
+callback: Callback function (params: msg, broadcast)
 Description: Registers a callback function for messages sent by other
-minetest servers
+minetest servers, broadcast is true if all servers were sent
+the message
 ```

functions.lua

@@ -59,10 +59,14 @@ multiserver.get_servers = function(cb)
 	multiserver.do_rpc("<-GETSRVS", cb)
 end
 
-multiserver.send_msg = function(msg)
+multiserver.broadcast_msg = function(msg)
 	multiserver.do_rpc("<-MT2MT " .. msg, nil)
 end
 
+multiserver.send_msg = function(tosrv, msg)
+	multiserver.do_rpc("<-MSG2MT " .. tosrv .. " " .. msg, nil)
+end
+
 multiserver.register_on_joinplayer = function(cb)
 	table.insert(multiserver.on_joinplayer, cb)
 end

rpc.lua

@@ -57,13 +57,14 @@ minetest.register_on_modchannel_message(function(channel_name, sender, msg)
 		end
 	elseif cmd == "->MT2MT" then
 		local smsg = msg:split(" ")
+		local broadcast = multiserver.to_bool(smsg[2])
 		local m = ""
 		for i = 3, #smsg do
 			m = m .. smsg[i]
 			if i < #smsg then m = m .. " " end
 		end
 		for _, f in ipairs(multiserver.on_msg) do
-			f(m)
+			f(m, broadcast)
 		end
 	end
 	if cb[rrq] == nil then return end