diff --git a/crates/core/src/bc_protocol/connection/discovery.rs b/crates/core/src/bc_protocol/connection/discovery.rs
index 8c5434ab..4788b8f5 100644
--- a/crates/core/src/bc_protocol/connection/discovery.rs
+++ b/crates/core/src/bc_protocol/connection/discovery.rs
@@ -421,19 +421,24 @@ impl Discoverer {
             }),
         };
         trace!("Sending look up {:?}", msg);
-        let (packet, _) = self
+        let (reg, relay, _) = self
             .retry_send(msg, addr, |bc, addr| match bc {
                 UdpDiscovery {
                     tid: _,
-                    payload: UdpXml::M2cQr(m2c_q_r),
-                } if valid_addr(&m2c_q_r.reg) => Some((m2c_q_r, addr)),
+                    payload:
+                        UdpXml::M2cQr(M2cQr {
+                            reg: Some(reg),
+                            relay: Some(relay),
+                            ..
+                        }),
+                } if valid_addr(&reg) && valid_addr(&relay) => Some((reg, relay, addr)),
                 _ => None,
             })
             .await?;
         trace!("Look up complete");
         Ok(UidLookupResults {
-            reg: SocketAddr::new(packet.reg.ip.parse()?, packet.reg.port),
-            relay: SocketAddr::new(packet.relay.ip.parse()?, packet.relay.port),
+            reg: SocketAddr::new(reg.ip.parse()?, reg.port),
+            relay: SocketAddr::new(relay.ip.parse()?, relay.port),
         })
     }
 
@@ -489,14 +494,15 @@ impl Discoverer {
                                 dmap,
                                 dev,
                                 relay,
-                                sid,
+                                sid: Some(sid),
                                 rsp,
                                 ..
                             }),
                     } if (dev.as_ref().map(valid_addr).unwrap_or(false)
                         || dmap.as_ref().map(valid_addr).unwrap_or(false)
                         || relay.as_ref().map(valid_addr).unwrap_or(false))
-                        && rsp != -1 =>
+                        && rsp != -1
+                        && rsp != -3 =>
                     {
                         Some(Ok((sid, dev, dmap, relay)))
                     }
@@ -544,7 +550,7 @@ impl Discoverer {
                     } if (dev.as_ref().map(valid_addr).unwrap_or(false)
                         || dmap.as_ref().map(valid_addr).unwrap_or(false)
                         || relay.as_ref().map(valid_addr).unwrap_or(false))
-                        && rsp == -1 =>
+                        && (rsp == -1 || rsp == -3) =>
                     {
                         Some(Err(Error::RegisterError))
                     }
diff --git a/crates/core/src/bcudp/xml.rs b/crates/core/src/bcudp/xml.rs
index b60dead6..397e707c 100644
--- a/crates/core/src/bcudp/xml.rs
+++ b/crates/core/src/bcudp/xml.rs
@@ -146,7 +146,7 @@ pub struct ClientList {
 pub struct D2cCr {
     /// Called timer but not sure what it is a timer of
     pub timer: Timer,
-    /// Unknown
+    /// Unknown seems to be 0 on success and -3 on fail
     pub rsp: u32,
     /// Client ID
     pub cid: i32,
@@ -237,13 +237,17 @@ pub struct C2mQ {
 #[derive(PartialEq, Eq, Default, Debug, Deserialize, Serialize, Clone)]
 pub struct M2cQr {
     /// The register server location
-    pub reg: IpPort,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub reg: Option<IpPort>,
     /// The relay server location
-    pub relay: IpPort,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub relay: Option<IpPort>,
     /// The log server location
-    pub log: IpPort,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub log: Option<IpPort>,
     /// The camera location
-    pub t: IpPort,
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub t: Option<IpPort>,
 }
 
 /// Used as part of M2C_Q_R to provide the host and port
@@ -328,11 +332,14 @@ pub struct R2cCr {
     /// The location of the relay
     #[serde(skip_serializing_if = "Option::is_none")]
     pub relay: Option<IpPort>,
+    /// The location of the relayt (not sure what the t is for)
+    #[serde(skip_serializing_if = "Option::is_none")]
+    pub relayt: Option<IpPort>,
     /// The nat type. Known values `"NULL"`
     pub nat: String,
-    /// The camera SID
-    pub sid: u32,
-    /// rsp. Known values `0`
+    /// The camera SID, missing when rsp is `-3`
+    pub sid: Option<u32>,
+    /// rsp. Known values `0`, `-3, seems to be 0 on success and -3 on fail`
     pub rsp: i32,
     /// ac. Known values. `127536491`
     pub ac: u32,
@@ -347,7 +354,7 @@ pub struct D2cCfm {
     pub sid: u32,
     /// Type of connection observed values are `"local"`
     pub conn: String,
-    /// Unknown known values are `0`
+    /// Unknown known values are `0`, `-3, seems to be 0 on success and -3 on fail`
     pub rsp: u32,
     /// The client connection ID
     pub cid: i32,
@@ -366,7 +373,7 @@ pub struct C2rCfm {
     pub sid: u32,
     /// Type of connection observed values are `"local"`
     pub conn: String,
-    /// Unknown known values are `0`
+    /// Unknown known values are  `0`, `-3, seems to be 0 on success and -3 on fail`
     pub rsp: u32,
     /// The client connection ID
     pub cid: i32,