lp: add TxSequence field

refs #3931

Change-Id: Ie388ec48494b8ac506b31dc42de8777a8cd28989
diff --git a/src/lp/fields.hpp b/src/lp/fields.hpp
index 3d0b0c2..caa2337 100644
--- a/src/lp/fields.hpp
+++ b/src/lp/fields.hpp
@@ -79,6 +79,11 @@
                           true> AckField;
 BOOST_CONCEPT_ASSERT((Field<AckField>));
 
+typedef detail::FieldDecl<field_location_tags::Header,
+                          Sequence,
+                          tlv::TxSequence> TxSequenceField;
+BOOST_CONCEPT_ASSERT((Field<TxSequenceField>));
+
 /**
  * The value of the wire encoded field is the data between the provided iterators. During
  * encoding, the data is copied from the Buffer into the wire buffer.
@@ -101,7 +106,8 @@
   CachePolicyField,
   IncomingFaceIdField,
   CongestionMarkField,
-  AckField
+  AckField,
+  TxSequenceField
   > FieldSet;
 
 } // namespace lp
diff --git a/src/lp/tlv.hpp b/src/lp/tlv.hpp
index 4ef0c9b..0fd782e 100644
--- a/src/lp/tlv.hpp
+++ b/src/lp/tlv.hpp
@@ -42,7 +42,8 @@
   CachePolicyType = 821,
   IncomingFaceId = 817,
   CongestionMark = 832,
-  Ack = 836
+  Ack = 836,
+  TxSequence = 840
 };
 
 enum {