Need to flush io in release mode

src/main.zig

@@ -48,9 +48,11 @@ pub fn main() !void {
         return clap.help(std.io.getStdErr().writer(), clap.Help, &params, .{});
     }
 
+    std.debug.print("main\n", .{});
+
     if (res.args.relay) |r| {
         try Saprus.sendRelay(if (r.len > 0) r else "Hello darkness my old friend", gpa);
-        // std.debug.print("Sent: {s}\n", .{r});
+        std.debug.print("Sent: {s}\n", .{r});
         return;
     } else if (res.args.connect) |c| {
         const conn_res: ?SaprusMessage = Saprus.connect(if (c.len > 0) c else "Hello darkness my old friend", gpa) catch |err| switch (err) {

src/saprus.zig

@@ -42,7 +42,7 @@ fn broadcastSaprusMessage(msg: SaprusMessage, udp_port: u16, allocator: Allocato
 pub fn sendRelay(payload: []const u8, allocator: Allocator) !void {
     const msg = SaprusMessage{
         .relay = .{
-            .header = .{ .dest = .{ 70, 70, 70, 70 } },
+            .header = .{ .dest = .{ 255, 255, 255, 255 } },
             .payload = payload,
         },
     };
@@ -85,9 +85,11 @@ pub fn connect(payload: []const u8, allocator: Allocator) !?SaprusMessage {
     var initial_conn_res: ?SaprusMessage = null;
     errdefer if (initial_conn_res) |c| c.deinit(allocator);
 
+    std.debug.print("creating socket\n", .{});
     var sock = try network.Socket.create(.ipv4, .udp);
     defer sock.close();
 
+    std.debug.print("creating endpoint\n", .{});
     // Bind to 255.255.255.255:8888
     const bind_addr = network.EndPoint{
         .address = network.Address{ .ipv4 = network.Address.IPv4.broadcast },
@@ -96,8 +98,10 @@ pub fn connect(payload: []const u8, allocator: Allocator) !?SaprusMessage {
 
     // timeout 1s
     try sock.setReadTimeout(1 * std.time.us_per_s);
+    std.debug.print("binding to socket\n", .{});
     try sock.bind(bind_addr);
 
+    std.debug.print("sending initial connection payload\n", .{});
     const msg = try sendInitialConnection(payload, initial_port, allocator);
 
     var response_buf: [4096]u8 = undefined;