smaller timeout for android and self-hosting

src/common.rs

@@ -1328,3 +1328,10 @@ pub fn create_symmetric_key_msg(their_pk_b: [u8; 32]) -> (Bytes, Bytes, secretbo
     let sealed_key = box_::seal(&key.0, &nonce, &their_pk_b, &out_sk_b);
     (Vec::from(our_pk_b.0).into(), sealed_key.into(), key)
 }
+
+#[inline]
+pub fn using_public_server() -> bool {
+    option_env!("RENDEZVOUS_SERVER").unwrap_or("").is_empty()
+        && crate::get_custom_rendezvous_server(get_option("custom-rendezvous-server")).is_empty()
+}
+