diff --git a/core/conversation.go b/core/conversation.go
index 7c28042..c91a7ec 100644
--- a/core/conversation.go
+++ b/core/conversation.go
@@ -136,9 +136,7 @@ func (c *Conversation) Send(text string) (*ricochet.Message, error) {
 			message.Status = ricochet.Message_QUEUED
 		}
 	} else {
-		// XXX go-ricochet doesn't support message IDs & ack properly yet, so skip SENDING
-		//message.Status = ricochet.Message_SENDING
-		message.Status = ricochet.Message_DELIVERED
+		message.Status = ricochet.Message_SENDING
 	}
 
 	c.messages = append(c.messages, message)
@@ -177,9 +175,7 @@ func (c *Conversation) SendQueuedMessages() int {
 				break
 			}
 		} else {
-			// XXX go-ricochet doesn't support message IDs & ack properly yet, so skip SENDING
-			//message.Status = ricochet.Message_SENDING
-			message.Status = ricochet.Message_DELIVERED
+			message.Status = ricochet.Message_SENDING
 			sent++
 		}
 
@@ -229,11 +225,10 @@ func (c *Conversation) ChatMessage(messageID uint32, when time.Time, message str
 	return true
 }
 
-func (c *Conversation) ChatMessageAck(messageID uint32) {
-	// XXX no success field
-	log.Printf("chat ack: %d", messageID)
+func (c *Conversation) ChatMessageAck(messageID uint32, accepted bool) {
+	log.Printf("chat ack: %d %v", messageID, accepted)
 
-	c.UpdateSentStatus(uint64(messageID), true)
+	c.UpdateSentStatus(uint64(messageID), accepted)
 }
 
 func (c *Conversation) sendMessageToConnection(message *ricochet.Message) (connected bool, err error) {
@@ -259,8 +254,11 @@ func (c *Conversation) sendMessageToConnection(message *ricochet.Message) (conne
 			return errors.New("invalid chat channel")
 		}
 
-		// XXX message id and all of that
-		chat.SendMessage(message.Text)
+		// Set message.Timestamp now if unset
+		if message.Timestamp == 0 {
+			message.Timestamp = time.Now().Unix()
+		}
+		message.Identifier = uint64(chat.SendMessageWithTime(message.Text, time.Unix(message.Timestamp, 0)))
 		return nil
 	})
 
diff --git a/vendor/github.com/s-rah/go-ricochet/application/application.go b/vendor/github.com/s-rah/go-ricochet/application/application.go
index 4338899..67ce40f 100644
--- a/vendor/github.com/s-rah/go-ricochet/application/application.go
+++ b/vendor/github.com/s-rah/go-ricochet/application/application.go
@@ -60,7 +60,7 @@ func (rai *RicochetApplicationInstance) ChatMessage(messageID uint32, when time.
 	return true
 }
 
-func (rai *RicochetApplicationInstance) ChatMessageAck(messageID uint32) {
+func (rai *RicochetApplicationInstance) ChatMessageAck(messageID uint32, accepted bool) {
 	rai.ChatMessageAckHandler(rai, messageID)
 }
 
diff --git a/vendor/github.com/s-rah/go-ricochet/channels/chatchannel.go b/vendor/github.com/s-rah/go-ricochet/channels/chatchannel.go
index c4e6e19..01ba01e 100644
--- a/vendor/github.com/s-rah/go-ricochet/channels/chatchannel.go
+++ b/vendor/github.com/s-rah/go-ricochet/channels/chatchannel.go
@@ -35,22 +35,34 @@ type ChatChannelHandler interface {
 	// the message successfully, and false to NACK and refuse the message.
 	ChatMessage(messageID uint32, when time.Time, message string) bool
 	// ChatMessageAck is called when an acknowledgement of a sent message is received.
-	ChatMessageAck(messageID uint32)
+	ChatMessageAck(messageID uint32, accepted bool)
 }
 
-// SendMessage sends a given message using this channe
-func (cc *ChatChannel) SendMessage(message string) {
+// SendMessage sends a given message using this channel, and returns the
+// messageID, which will be used in ChatMessageAck when the peer acknowledges
+// this message.
+func (cc *ChatChannel) SendMessage(message string) uint32 {
+	return cc.SendMessageWithTime(message, time.Now())
+}
+
+// SendMessageWithTime is identical to SendMessage, but also sends the provided time.Time
+// as a rough timestamp for when this message was originally sent. This should be used
+// when retrying or sending queued messages.
+func (cc *ChatChannel) SendMessageWithTime(message string, when time.Time) uint32 {
+	delta := time.Now().Sub(when) / time.Second
 	messageBuilder := new(utils.MessageBuilder)
-	//TODO Implement Chat Number
-	data := messageBuilder.ChatMessage(message, cc.lastMessageID)
+	messageID := cc.lastMessageID
 	cc.lastMessageID++
+	data := messageBuilder.ChatMessage(message, messageID, int64(delta))
 	cc.channel.SendMessage(data)
+	return messageID
 }
 
-// Acknowledge indicates the given messageID was received
-func (cc *ChatChannel) Acknowledge(messageID uint32) {
+// Acknowledge indicates that the given messageID was received, and whether
+// it was accepted.
+func (cc *ChatChannel) Acknowledge(messageID uint32, accepted bool) {
 	messageBuilder := new(utils.MessageBuilder)
-	cc.channel.SendMessage(messageBuilder.AckChatMessage(messageID))
+	cc.channel.SendMessage(messageBuilder.AckChatMessage(messageID, accepted))
 }
 
 // Type returns the type string for this channel, e.g. "im.ricochet.chat".
@@ -132,13 +144,9 @@ func (cc *ChatChannel) Packet(data []byte) {
 		if err == nil {
 			if res.GetChatMessage() != nil {
 				ack := cc.Handler.ChatMessage(res.GetChatMessage().GetMessageId(), time.Now(), res.GetChatMessage().GetMessageText())
-				if ack {
-					cc.Acknowledge(res.GetChatMessage().GetMessageId())
-				} else {
-					//XXX
-				}
-			} else if res.GetChatAcknowledge() != nil {
-				cc.Handler.ChatMessageAck(res.GetChatMessage().GetMessageId())
+				cc.Acknowledge(res.GetChatMessage().GetMessageId(), ack)
+			} else if ack := res.GetChatAcknowledge(); ack != nil {
+				cc.Handler.ChatMessageAck(ack.GetMessageId(), ack.GetAccepted())
 			}
 			// XXX?
 		}
diff --git a/vendor/github.com/s-rah/go-ricochet/examples/echobot/main.go b/vendor/github.com/s-rah/go-ricochet/examples/echobot/main.go
index d3a341f..362c3a5 100644
--- a/vendor/github.com/s-rah/go-ricochet/examples/echobot/main.go
+++ b/vendor/github.com/s-rah/go-ricochet/examples/echobot/main.go
@@ -32,7 +32,7 @@ func (echobot *RicochetEchoBot) ChatMessage(messageID uint32, when time.Time, me
 	return true
 }
 
-func (echobot *RicochetEchoBot) ChatMessageAck(messageID uint32) {
+func (echobot *RicochetEchoBot) ChatMessageAck(messageID uint32, accepted bool) {
 
 }
 
diff --git a/vendor/github.com/s-rah/go-ricochet/utils/messagebuilder.go b/vendor/github.com/s-rah/go-ricochet/utils/messagebuilder.go
index bd5616f..9b932f1 100644
--- a/vendor/github.com/s-rah/go-ricochet/utils/messagebuilder.go
+++ b/vendor/github.com/s-rah/go-ricochet/utils/messagebuilder.go
@@ -195,10 +195,11 @@ func (mb *MessageBuilder) AuthResult(accepted bool, isKnownContact bool) []byte
 }
 
 // ChatMessage constructs a chat message with the given content.
-func (mb *MessageBuilder) ChatMessage(message string, messageID uint32) []byte {
+func (mb *MessageBuilder) ChatMessage(message string, messageID uint32, timeDelta int64) []byte {
 	cm := &Protocol_Data_Chat.ChatMessage{
 		MessageId:   proto.Uint32(messageID),
 		MessageText: proto.String(message),
+		TimeDelta:   proto.Int64(timeDelta),
 	}
 	chatPacket := &Protocol_Data_Chat.Packet{
 		ChatMessage: cm,
@@ -209,10 +210,10 @@ func (mb *MessageBuilder) ChatMessage(message string, messageID uint32) []byte {
 }
 
 // AckChatMessage constructs a chat message acknowledgement.
-func (mb *MessageBuilder) AckChatMessage(messageID uint32) []byte {
+func (mb *MessageBuilder) AckChatMessage(messageID uint32, accepted bool) []byte {
 	cr := &Protocol_Data_Chat.ChatAcknowledge{
 		MessageId: proto.Uint32(messageID),
-		Accepted:  proto.Bool(true),
+		Accepted:  proto.Bool(accepted),
 	}
 	pc := &Protocol_Data_Chat.Packet{
 		ChatAcknowledge: cr,
diff --git a/vendor/manifest b/vendor/manifest
index 2684816..d674609 100644
--- a/vendor/manifest
+++ b/vendor/manifest
@@ -63,7 +63,7 @@
 			"importpath": "github.com/s-rah/go-ricochet",
 			"repository": "https://github.com/special/go-ricochet-protocol",
 			"vcs": "git",
-			"revision": "5b54d50bf4611a36c23dd732bd1e9d0dad441980",
+			"revision": "e5211eec18a2b58d379e232088154925439a74c0",
 			"branch": "api-rework-fixes",
 			"notests": true
 		},