RPI: properly catch exception when crc8 check failed

tools/rpi/hoymiles/__init__.py

@@ -203,7 +203,7 @@ class InverterPacketFragment:
 
         # check crc8
         if f_crc8(payload[:-1]) != payload[-1]:
-            raise BufferError('Frame kaputt')
+            raise BufferError('Frame corrupted - crc8 check failed')
 
         self.ch_rx = ch_rx
         self.ch_tx = ch_tx

tools/rpi/hoymiles/__main__.py

@@ -86,8 +86,8 @@ def poll_inverter(inverter, do_init, retries=4):
                         dst=inverter_ser
                         )))
             response = None
-            while com.rxtx():
             try:
+                while com.rxtx():
                     response = com.get_payload()
                     payload_ttl = 0
             except Exception as e_all: