so, that was a B7, not an 87. hours of my life gone, because of two pixels

src/platform/aws.rs

@@ -13,7 +13,7 @@ impl std::fmt::Display for InvalidHeartbeatResponse {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         write!(
             f,
-            "Invalid heartbeat response: expected 0x87, got 0x{}",
+            "Invalid heartbeat response: expected 0xB7, got 0x{}",
             self.0
         )
     }
@@ -31,9 +31,10 @@ impl Aws {
             svm_family: SocketFamily::Vsock as u16,
             svm_port: 9000,
             svm_cid: 3,
-            ..(unsafe { std::mem::zeroed() })
+            svm_reserved1: 0,
+            svm_zero: [0; 4],
         };
-        let mut buf = [0x87];
+        let mut buf = [0xB7];
 
         let fd = socket(SocketFamily::Vsock, SocketType::Stream)?;
         unsafe {
@@ -43,11 +44,12 @@ impl Aws {
                 std::mem::size_of_val(&sockaddr),
             )?;
         };
-        dbg!(write(fd, &buf));
-        dbg!(read(fd, &mut buf));
-        dbg!(close(fd));
 
-        if buf[0] != 0x87 {
+        write(fd, &buf)?;
+        read(fd, &mut buf)?;
+        close(fd)?;
+
+        if buf[0] != 0xB7 {
             return Err(InvalidHeartbeatResponse(buf[0]))
                 .context(format_args!("Bad value from heartbeat"));
         }