diff --git a/src/iperf3.zig b/src/iperf3.zig
index d53068d..7bdd523 100644
--- a/src/iperf3.zig
+++ b/src/iperf3.zig
@@ -49,6 +49,12 @@ pub const IPerfReturn = struct {
             seconds: f128,
             bytes: u64,
             bits_per_second: f128,
+            retransmits: ?u64 = null,
+            snd_cwnd: ?u64 = null,
+            snd_wnd: ?u64 = null,
+            rtt: ?u64 = null,
+            rttvar: ?u64 = null,
+            pmtu: ?u64 = null,
             omitted: bool,
             sender: bool,
         },
@@ -58,6 +64,7 @@ pub const IPerfReturn = struct {
             seconds: f128,
             bytes: u64,
             bits_per_second: f128,
+            retransmits: ?u64 = null,
             omitted: bool,
             sender: bool,
         },
@@ -71,6 +78,12 @@ pub const IPerfReturn = struct {
                 seconds: f128,
                 bytes: u64,
                 bits_per_second: f128,
+                retransmits: ?u64 = null,
+                max_snd_cwnd: ?u64 = null,
+                max_snd_wnd: ?u64 = null,
+                max_rtt: ?u64 = null,
+                min_rtt: ?u64 = null,
+                mean_rtt: ?u64 = null,
                 sender: bool,
             },
             receiver: struct {
@@ -89,6 +102,7 @@ pub const IPerfReturn = struct {
             seconds: f128,
             bytes: u64,
             bits_per_second: f128,
+            retransmits: ?u64 = null,
             sender: bool,
         } = null,
         sum_received: ?struct {
@@ -108,17 +122,43 @@ pub const IPerfReturn = struct {
             remote_system: f128,
         } = null,
         receiver_tcp_congestion: ?[]const u8 = null,
+        sender_tcp_congestion: ?[]const u8 = null,
     },
     @"error": ?[]const u8 = null,
 };
 
-test "test-normal" {
-    const input = @embedFile("test/test-normal.json");
-    const result = try std.json.parseFromSlice(IPerfReturn, std.testing.allocator, input, .{});
+test "test-receiver-1" {
+    const input = @embedFile("test/test-receiver-1.json");
+    const result = try std.json.parseFromSlice(
+        IPerfReturn,
+        std.testing.allocator,
+        input,
+        .{},
+    );
+    defer result.deinit();
+    try std.testing.expect(result.value.@"error" == null);
+}
+
+test "test-receiver-2" {
+    const input = @embedFile("test/test-receiver-2.json");
+    const result = try std.json.parseFromSlice(
+        IPerfReturn,
+        std.testing.allocator,
+        input,
+        .{},
+    );
+    defer result.deinit();
+    try std.testing.expect(result.value.@"error" == null);
+}
+
+test "test-sender-1" {
+    const input = @embedFile("test/test-sender-1.json");
+    const result = try std.json.parseFromSlice(
+        IPerfReturn,
+        std.testing.allocator,
+        input,
+        .{},
+    );
     defer result.deinit();
-    // std.debug.print("{}\n", .{result.value});
-    // const test_output = try std.fs.cwd().createFile("test.json", .{});
-    // try std.json.stringify(result.value, .{}, test_output.writer());
-    // test_output.close();
     try std.testing.expect(result.value.@"error" == null);
 }
diff --git a/src/test/test-normal.json b/src/test/test-receiver-1.json
similarity index 100%
rename from src/test/test-normal.json
rename to src/test/test-receiver-1.json
diff --git a/src/test/test-receiver-2.json b/src/test/test-receiver-2.json
new file mode 100644
index 0000000..c766683
--- /dev/null
+++ b/src/test/test-receiver-2.json
@@ -0,0 +1,310 @@
+{
+	"start":	{
+		"connected":	[{
+				"socket":	5,
+				"local_host":	"127.0.0.1",
+				"local_port":	5201,
+				"remote_host":	"127.0.0.1",
+				"remote_port":	43398
+			}],
+		"version":	"iperf 3.14",
+		"system_info":	"Linux localhost 6.5.5 #1-NixOS SMP PREEMPT_DYNAMIC Sat Sep 23 09:14:39 UTC 2023 x86_64",
+		"sock_bufsize":	0,
+		"sndbuf_actual":	16384,
+		"rcvbuf_actual":	131072,
+		"timestamp":	{
+			"time":	"Sun, 15 Oct 2023 04:15:59 GMT",
+			"timesecs":	1697343359
+		},
+		"accepted_connection":	{
+			"host":	"127.0.0.1",
+			"port":	43384
+		},
+		"cookie":	"qrmdwiyjmzfojrcbndv2ek6wwjv6ewafzw2n",
+		"tcp_mss_default":	0,
+		"target_bitrate":	0,
+		"fq_rate":	0,
+		"test_start":	{
+			"protocol":	"TCP",
+			"num_streams":	1,
+			"blksize":	131072,
+			"omit":	0,
+			"duration":	10,
+			"bytes":	0,
+			"blocks":	0,
+			"reverse":	0,
+			"tos":	0,
+			"target_bitrate":	0,
+			"bidir":	0,
+			"fqrate":	0
+		}
+	},
+	"intervals":	[{
+			"streams":	[{
+					"socket":	5,
+					"start":	0,
+					"end":	1.000018,
+					"seconds":	1.0000180006027222,
+					"bytes":	7176519627,
+					"bits_per_second":	57411123581.172585,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	0,
+				"end":	1.000018,
+				"seconds":	1.0000180006027222,
+				"bytes":	7176519627,
+				"bits_per_second":	57411123581.172585,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	1.000018,
+					"end":	2.000009,
+					"seconds":	0.999990999698639,
+					"bytes":	7434141696,
+					"bits_per_second":	59473668848.942688,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	1.000018,
+				"end":	2.000009,
+				"seconds":	0.999990999698639,
+				"bytes":	7434141696,
+				"bits_per_second":	59473668848.942688,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	2.000009,
+					"end":	3.000004,
+					"seconds":	0.999994993209839,
+					"bytes":	7413039104,
+					"bits_per_second":	59304609757.736649,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	2.000009,
+				"end":	3.000004,
+				"seconds":	0.999994993209839,
+				"bytes":	7413039104,
+				"bits_per_second":	59304609757.736649,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	3.000004,
+					"end":	4.000004,
+					"seconds":	1,
+					"bytes":	7397703680,
+					"bits_per_second":	59181629440,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	3.000004,
+				"end":	4.000004,
+				"seconds":	1,
+				"bytes":	7397703680,
+				"bits_per_second":	59181629440,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	4.000004,
+					"end":	5.000017,
+					"seconds":	1.000012993812561,
+					"bytes":	7376601088,
+					"bits_per_second":	59012041912.588547,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	4.000004,
+				"end":	5.000017,
+				"seconds":	1.000012993812561,
+				"bytes":	7376601088,
+				"bits_per_second":	59012041912.588547,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	5.000017,
+					"end":	6.000006,
+					"seconds":	0.99998897314071655,
+					"bytes":	7419592704,
+					"bits_per_second":	59357396157.654861,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	5.000017,
+				"end":	6.000006,
+				"seconds":	0.99998897314071655,
+				"bytes":	7419592704,
+				"bits_per_second":	59357396157.654861,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	6.000006,
+					"end":	7.000011,
+					"seconds":	1.0000050067901611,
+					"bytes":	7421427712,
+					"bits_per_second":	59371124437.238312,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	6.000006,
+				"end":	7.000011,
+				"seconds":	1.0000050067901611,
+				"bytes":	7421427712,
+				"bits_per_second":	59371124437.238312,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	7.000011,
+					"end":	8.000006,
+					"seconds":	0.999994993209839,
+					"bytes":	7382106112,
+					"bits_per_second":	59057144582.730438,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	7.000011,
+				"end":	8.000006,
+				"seconds":	0.999994993209839,
+				"bytes":	7382106112,
+				"bits_per_second":	59057144582.730438,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	8.000006,
+					"end":	9.000014,
+					"seconds":	1.0000079870224,
+					"bytes":	7378567168,
+					"bits_per_second":	59028065885.515549,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	8.000006,
+				"end":	9.000014,
+				"seconds":	1.0000079870224,
+				"bytes":	7378567168,
+				"bits_per_second":	59028065885.515549,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	9.000014,
+					"end":	10.000021,
+					"seconds":	1.0000070333480835,
+					"bytes":	7368278069,
+					"bits_per_second":	58945809965.600449,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	9.000014,
+				"end":	10.000021,
+				"seconds":	1.0000070333480835,
+				"bytes":	7368278069,
+				"bits_per_second":	58945809965.600449,
+				"omitted":	false,
+				"sender":	false
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	10.000021,
+					"end":	10.000122,
+					"seconds":	0.00010099999781232327,
+					"bytes":	655360,
+					"bits_per_second":	51909704094.669815,
+					"omitted":	false,
+					"sender":	false
+				}],
+			"sum":	{
+				"start":	10.000021,
+				"end":	10.000122,
+				"seconds":	0.00010099999781232327,
+				"bytes":	655360,
+				"bits_per_second":	51909704094.669815,
+				"omitted":	false,
+				"sender":	false
+			}
+		}],
+	"end":	{
+		"streams":	[{
+				"sender":	{
+					"socket":	5,
+					"start":	0,
+					"end":	10.000122,
+					"seconds":	10.000122,
+					"bytes":	0,
+					"bits_per_second":	0,
+					"sender":	false
+				},
+				"receiver":	{
+					"socket":	5,
+					"start":	0,
+					"end":	10.000122,
+					"seconds":	10.000122,
+					"bytes":	73768632320,
+					"bits_per_second":	59014185882.932236,
+					"sender":	false
+				}
+			}],
+		"sum_sent":	{
+			"start":	0,
+			"end":	10.000122,
+			"seconds":	10.000122,
+			"bytes":	0,
+			"bits_per_second":	0,
+			"sender":	false
+		},
+		"sum_received":	{
+			"start":	0,
+			"end":	10.000122,
+			"seconds":	10.000122,
+			"bytes":	73768632320,
+			"bits_per_second":	59014185882.932236,
+			"sender":	false
+		},
+		"cpu_utilization_percent":	{
+			"host_total":	88.9689744343579,
+			"host_user":	3.04800732789741,
+			"host_system":	85.9209771063205,
+			"remote_total":	0,
+			"remote_user":	0,
+			"remote_system":	0
+		},
+		"receiver_tcp_congestion":	"cubic"
+	}
+}
diff --git a/src/test/test-sender-1.json b/src/test/test-sender-1.json
new file mode 100644
index 0000000..ce5cb59
--- /dev/null
+++ b/src/test/test-sender-1.json
@@ -0,0 +1,367 @@
+{
+	"start":	{
+		"connected":	[{
+				"socket":	5,
+				"local_host":	"127.0.0.1",
+				"local_port":	5201,
+				"remote_host":	"127.0.0.1",
+				"remote_port":	53792
+			}],
+		"version":	"iperf 3.14",
+		"system_info":	"Linux localhost 6.5.5 #1-NixOS SMP PREEMPT_DYNAMIC Sat Sep 23 09:14:39 UTC 2023 x86_64",
+		"sock_bufsize":	0,
+		"sndbuf_actual":	16384,
+		"rcvbuf_actual":	131072,
+		"timestamp":	{
+			"time":	"Sun, 15 Oct 2023 04:15:28 GMT",
+			"timesecs":	1697343328
+		},
+		"accepted_connection":	{
+			"host":	"127.0.0.1",
+			"port":	53780
+		},
+		"cookie":	"dwrtd4tteunw6ixmyqwigqrn6axjjesxiavl",
+		"tcp_mss_default":	0,
+		"target_bitrate":	0,
+		"fq_rate":	0,
+		"test_start":	{
+			"protocol":	"TCP",
+			"num_streams":	1,
+			"blksize":	131072,
+			"omit":	0,
+			"duration":	10,
+			"bytes":	0,
+			"blocks":	0,
+			"reverse":	1,
+			"tos":	0,
+			"target_bitrate":	0,
+			"bidir":	0,
+			"fqrate":	0
+		}
+	},
+	"intervals":	[{
+			"streams":	[{
+					"socket":	5,
+					"start":	0,
+					"end":	1.000502,
+					"seconds":	1.0005019903182983,
+					"bytes":	7434403840,
+					"bits_per_second":	59445389709.898163,
+					"retransmits":	0,
+					"snd_cwnd":	1113211,
+					"snd_wnd":	3144704,
+					"rtt":	21,
+					"rttvar":	6,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	0,
+				"end":	1.000502,
+				"seconds":	1.0005019903182983,
+				"bytes":	7434403840,
+				"bits_per_second":	59445389709.898163,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	1.000502,
+					"end":	2.000387,
+					"seconds":	0.99988502264022827,
+					"bytes":	6927155200,
+					"bits_per_second":	55423614060.813721,
+					"retransmits":	0,
+					"snd_cwnd":	1113211,
+					"snd_wnd":	3145216,
+					"rtt":	32,
+					"rttvar":	1,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	1.000502,
+				"end":	2.000387,
+				"seconds":	0.99988502264022827,
+				"bytes":	6927155200,
+				"bits_per_second":	55423614060.813721,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	2.000387,
+					"end":	3.000241,
+					"seconds":	0.999854028224945,
+					"bytes":	6613893120,
+					"bits_per_second":	52918869621.332527,
+					"retransmits":	0,
+					"snd_cwnd":	1113211,
+					"snd_wnd":	3145216,
+					"rtt":	31,
+					"rttvar":	3,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	2.000387,
+				"end":	3.000241,
+				"seconds":	0.999854028224945,
+				"bytes":	6613893120,
+				"bits_per_second":	52918869621.332527,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	3.000241,
+					"end":	4.000234,
+					"seconds":	0.99999302625656128,
+					"bytes":	7197163520,
+					"bits_per_second":	57577709692.175186,
+					"retransmits":	0,
+					"snd_cwnd":	1178694,
+					"snd_wnd":	3145216,
+					"rtt":	22,
+					"rttvar":	5,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	3.000241,
+				"end":	4.000234,
+				"seconds":	0.99999302625656128,
+				"bytes":	7197163520,
+				"bits_per_second":	57577709692.175186,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	4.000234,
+					"end":	5.000321,
+					"seconds":	1.0000870227813721,
+					"bytes":	7333478400,
+					"bits_per_second":	58662722206.7507,
+					"retransmits":	0,
+					"snd_cwnd":	1309660,
+					"snd_wnd":	3145216,
+					"rtt":	25,
+					"rttvar":	4,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	4.000234,
+				"end":	5.000321,
+				"seconds":	1.0000870227813721,
+				"bytes":	7333478400,
+				"bits_per_second":	58662722206.7507,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	5.000321,
+					"end":	6.000227,
+					"seconds":	0.99990600347518921,
+					"bytes":	7186677760,
+					"bits_per_second":	57498826769.897064,
+					"retransmits":	0,
+					"snd_cwnd":	1309660,
+					"snd_wnd":	3145216,
+					"rtt":	25,
+					"rttvar":	3,
+					"pmtu":	65535,
+					"omitted":	false,
+					"sender":	true
+				}],
+			"sum":	{
+				"start":	5.000321,
+				"end":	6.000227,
+				"seconds":	0.99990600347518921,
+				"bytes":	7186677760,
+				"bits_per_second":	57498826769.897064,
+				"retransmits":	0,
+				"omitted":	false,
+				"sender":	true
+			}
+		}, {
+			"streams":	[{
+					"socket":	5,
+					"start":	6.000227,
+					"end":	7.000188,
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+	}
+}