diff --git a/src/main.rs b/src/main.rs
index abd8f44..1d1a7c0 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -106,7 +106,7 @@ async fn run() -> Result<()> {
     data.put_bytes(0x00, 21);
     data.put(args.auth_token.as_bytes());
     data.put_bytes(0x00, 81);
-    let initial_packet = make_iusb_packet(0x05, 0x01, 0x0000, 0x00, &data);
+    let initial_packet = make_iusb_packet(0x05, 0x01, 0x00, 0x00, 0x0000, 0x00000000, &data);
 
     //println!("SENT:\n{}", pretty_hex(&initial_packet));
     write.write_all(&initial_packet).await?;
@@ -125,7 +125,7 @@ async fn run() -> Result<()> {
     while let Some(mut packet) = stream.next().await.transpose()? {
         //println!("{}", pretty_hex(&packet));
 
-        let seq_num = packet[24];
+        let seq_num = u32::from_le_bytes(packet[24..28].try_into().unwrap());
 
         let packet = &mut packet[32..];
         let id = packet[4];
@@ -139,7 +139,7 @@ async fn run() -> Result<()> {
                 0x00,      0x00, 0x00, 0x00, 0x00, 0x01, 0x03, 0x30,
                 0x00,      0x00, 0x00, 0x00, 0x00
             ];
-            let packet = make_iusb_packet(0x80, 0x01, 0x0001, seq_num, resp.as_slice());
+            let packet = make_iusb_packet(0x80, 0x01, 0x01, 0x00, 0x0000, seq_num, resp.as_slice());
             //println!("SENT:\n{}", pretty_hex(&packet));
             write.write_all(&packet).await?;
             write.flush().await?;
@@ -170,7 +170,7 @@ async fn run() -> Result<()> {
                 0x00,      0x00, 0x00, 0x00, 0x00, 0x01, cmd_output.sense[2], cmd_output.sense[12],
                 0x00,      0x00, 0x00, 0x00, 0x00
             ];
-            let packet = make_iusb_packet(0x80, 0x01, 0x0001, seq_num, resp.as_slice());
+            let packet = make_iusb_packet(0x80, 0x01, 0x01, 0x00, 0x0000, seq_num, resp.as_slice());
             //println!("SENT:\n{}", pretty_hex(&packet));
             write.write_all(&packet).await?;
             write.flush().await?;
@@ -187,7 +187,7 @@ async fn run() -> Result<()> {
         resp.put(&resp_data[..]);
 
         //println!("responding\n{}", pretty_hex(&resp_data));
-        let packet = make_iusb_packet(0x80, 0x01, 0x0001, seq_num, resp.as_slice());
+        let packet = make_iusb_packet(0x80, 0x01, 0x01, 0x00, 0x0000, seq_num, resp.as_slice());
         //println!("SENT:\n{}", pretty_hex(&packet));
         write.write_all(&packet).await?;
         write.flush().await?;
@@ -197,10 +197,12 @@ async fn run() -> Result<()> {
 }
 
 fn make_iusb_packet(
+    device_type: u8,
+    protocol: u8,
     device_number: u8,
     interface_number: u8,
-    client_data: u32,
-    seq_num: u8,
+    client_data: u16,
+    seq_num: u32,
     data: &[u8],
 ) -> Vec<u8> {
     let data_len: u32 = data.len().try_into().unwrap();
@@ -212,13 +214,15 @@ fn make_iusb_packet(
     packet.put_u8(0x20); // headers length
     packet.put_u8(0x00); // checksum (unused)
     packet.put_u32_le(data_len); // data length
-    packet.put_bytes(0x0, 1); // unknown
+    packet.put_u8(0); // server caps
+    packet.put_u8(device_type);
+    packet.put_u8(protocol);
+    packet.put_u8(0x80); // direction (TX)
     packet.put_u8(device_number);
     packet.put_u8(interface_number);
-    packet.put_u8(0x80); // direction (TX)
-    packet.put_u32_le(client_data);
-    packet.put_u8(seq_num);
-    packet.put_bytes(0x00, 7); // reserved
+    packet.put_u16_le(client_data);
+    packet.put_u32_le(seq_num);
+    packet.put_bytes(0x00, 4); // reserved
 
     packet.put(data);