Allow clients to transmit payments

node.py

@@ -360,6 +360,15 @@ def receiver(node, b):
             }
             identifier = (addr[0:2], "transaction")
             receive_observer.publish(identifier, event_obj)
+        elif msg_type == 9:
+            # payment request
+            if msg_len != 153:
+                log(f"Got a payment of wrong length ({msg_len} bytes from {sender}, but expected 153 bytes)")
+                continue
+            parsed_transaction = blockchain.Transaction.from_bytes(msg[5:153])
+            if not parsed_transaction.is_valid():
+                continue
+            b.open_transactions.add(parsed_transaction)
         else:
             log(f"Got a udp message of unknown type from {sender}. (type {msg_type})")