[erlang-questions] Erlang udp server can't receive accept packets

[yuzhu chen]

I've posted the same question on stackoverflow, but haven't got answers
yet. So I posted this question again in here hoping for a solution.



down votefavorite
<http://stackoverflow.com/questions/43972714/erlang-udp-server-cant-receive-accept-packets#>

I have one simple udp server written in gen_server behaviour. When I run
it, and try to send message by using gen_udp:send, the server replies
nothing, seems like the udp server didn't accept packet successfully. Here
is my code

gen_udp_server.erl:

-module(gen_udp_server).-behaviour(gen_server).-export([init/1,
handle_call/3, handle_cast/2, handle_info/2, terminate/2,
code_change/3]).
-export([start_link/1]).
-define(SERVER, ?MODULE).
-record(state, {socket,
                port,
                local_ip,
                broad_ip}).

start_link(Port) ->
    {ok, Socket} = gen_udp:open(Port, [binary,
                                       {active, false},
                                       {reuseaddr, true}]),
    gen_server:start_link(?MODULE, [Socket, Port], []).

init([Socket, Port]) ->
    {ok, #state{socket = Socket, port = Port}}.

handle_cast(_Request, State) ->
    {noreply, State}.

handle_call(_Request, _From, State) ->
    {noreply, State}.

handle_info({udp, _Socket, _Addr, _Port, Data}, #state{socket =
Socket} = State) ->
    inet:setopts(Socket, [{active, once}]),
    io:format("Server received data ~p from socket ~p~n", [Data, Socket]),
    {ok, State}.

terminate(_Reason, {socket = LSocket}) ->
    gen_udp:close(LSocket).

code_change(_OldVsn, State, _Extra) ->
    {ok, State}.

Starting server on server 192.168.146.129: gen_udp_server:start_link(10000).

Sending message from 192.168.146.128:

{ok, Socket} = gen_udp:open(4399, [binary, {active, false}]).
gen_udp:send(Socket, {192,168,146,129}, 10000, "hello").

The udp server should print some message when it receives packets, but my
one failed. Can anyone help me?
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