6 files changed, 14 insertions, 2 deletions
diff --git a/src/transport/libp2p/tests.rs b/src/transport/libp2p/tests.rs
index 8f77bf7..7bedeaa 100644
--- a/src/transport/libp2p/tests.rs
+++ b/src/transport/libp2p/tests.rs
@@ -61,6 +61,7 @@ fn status() -> ParsedMessage {
         leaving: false,
         announcing: false,
         eager: false,
+        reaches: None,
     })
 }
 
diff --git a/src/transport/mod.rs b/src/transport/mod.rs
index 22782ef..9ae8ff2 100644
--- a/src/transport/mod.rs
+++ b/src/transport/mod.rs
@@ -210,6 +210,10 @@ pub(crate) struct Status {
     /// sent as sync messages (an eager link, `swarm::relay`), not only announced. Every
     /// STATUS says so, or not, again: one lost changes nothing for long.
     pub(crate) eager: bool,
+    /// Whom the sender reaches (`swarm::reach`): the pair keys (`topology::pair_key`)
+    /// of the members it has an active session with, sorted. In keepalive STATUSes and
+    /// their replies, and when it changed; not in announcements of heads (None).
+    pub(crate) reaches: Option<Vec<u64>>,
 }
 
 /// Cheap to clone: large parts are shared (`bytes::Bytes`).
diff --git a/src/transport/mycelium/mod.rs b/src/transport/mycelium/mod.rs
index 0562e72..76ef8cd 100644
--- a/src/transport/mycelium/mod.rs
+++ b/src/transport/mycelium/mod.rs
@@ -719,6 +719,7 @@ mod tests {
             leaving: false,
             announcing: false,
             eager: false,
+            reaches: None,
         };
         let payload = wire::encode(&ParsedMessage::StatusReply(status.clone())).unwrap();
         // Mycelium's message data: a length byte, the topic, then our payload.
diff --git a/src/transport/paths.rs b/src/transport/paths.rs
index 1cd21e8..3e595ab 100644
--- a/src/transport/paths.rs
+++ b/src/transport/paths.rs
@@ -1515,6 +1515,7 @@ mod tests {
             leaving: false,
             announcing: false,
             eager: false,
+            reaches: None,
         })
     }
 
diff --git a/src/transport/sim.rs b/src/transport/sim.rs
index af262aa..c9e45fb 100644
--- a/src/transport/sim.rs
+++ b/src/transport/sim.rs
@@ -389,6 +389,7 @@ mod tests {
             leaving: false,
             announcing: false,
             eager: false,
+            reaches: None,
         })
     }
 
diff --git a/src/transport/wire.rs b/src/transport/wire.rs
index fe690a2..a6ca286 100644
--- a/src/transport/wire.rs
+++ b/src/transport/wire.rs
@@ -14,7 +14,7 @@ use super::{EncodedMessage, MessageKind, ParsedMessage};
 
 /// The wire format's version, the first byte of every payload. Bump it with every change
 /// to a message type or a codec (`golden_bytes` fails then).
-pub(crate) const VERSION: u8 = 18;
+pub(crate) const VERSION: u8 = 21;
 
 /// What the second byte of a payload says.
 fn tag(kind: MessageKind) -> u8 {
@@ -371,6 +371,7 @@ pub(crate) fn samples() -> Vec<ParsedMessage> {
         leaving: false,
         announcing: false,
         eager: false,
+        reaches: None,
     };
     let proof = IdentityProof {
         key: [8; 32],
@@ -555,6 +556,7 @@ mod tests {
             leaving: false,
             announcing: false,
             eager: false,
+            reaches: None,
         };
         let decoded =
             decode(&encode(&ParsedMessage::StatusReply(status.clone())).unwrap()).unwrap();
@@ -580,6 +582,7 @@ mod tests {
             leaving: false,
             announcing: false,
             eager: false,
+            reaches: None,
         };
         assert!(decode(&encode(&ParsedMessage::Status(status)).unwrap()).is_err());
     }
@@ -679,10 +682,11 @@ mod tests {
             leaving: false,
             announcing: true,
             eager: false,
+            reaches: None,
         });
         assert_eq!(
             hex(&encode(&status).unwrap()),
-            format!("{v}03989290c400{epoch_hex}01c3c2c2c3c2")
+            format!("{v}03999290c400{epoch_hex}01c3c2c2c3c2c0")
         );
 
         let who = ParsedMessage::Who(IdentityProof {