Acknowledge Data TLVs

Signed-off-by: Yohann D'ANELLO <ynerant@crans.org>

squinnondation/messages.py

@@ -212,6 +212,9 @@ class DataTLV(TLV):
             # The message was already received
             return
 
+        # Acknowledge the packet
+        squirrel.send_packet(sender, Packet.construct(AckTLV.construct(sender.id, self.nonce)))
+
         nickname_match = re.match("(.*): (.*)", msg)
         if nickname_match is None:
             squirrel.send_packet(sender, Packet.construct(WarningTLV.construct(
@@ -263,6 +266,15 @@ class AckTLV(TLV):
         # TODO Implement AckTLV
         squirrel.add_system_message("I received an AckTLV. I don't know what to do with it. Please implement me!")
 
+    @staticmethod
+    def construct(sender_id: int, nonce: int) -> "AckTLV":
+        tlv = AckTLV()
+        tlv.type = 5
+        tlv.length = 12
+        tlv.sender_id = sender_id
+        tlv.nonce = nonce
+        return tlv
+
 
 class GoAwayTLV(TLV):
     class GoAwayType(Enum):