Add pypackage retransmit last frame

Mentioned in #30 by @stefan123t

tools/rpi/hoymiles/__init__.py

@@ -619,6 +619,8 @@ class InverterTransaction:
             self.time_rx = end_frame.time_rx
             tr_len = end_frame.seq - 0x80
         except StopIteration:
+            seq_last = max(frames, key=lambda frame:frame.seq).seq
+            self.__retransmit_frame(seq_last + 1)
             raise BufferError(f'Missing packet: Last packet {len(self.scratch)}')
 
         # Rebuild payload from unordered frames