Merge pull request #20 from ess-dmsc/all_return_bytes

All serialisation functions should return bytes

Author: matthew-d-jones

streaming_data_types/eventdata_ev42.py

@@ -113,4 +113,4 @@ def serialise_ev42(
     # Generate the output and replace the file_identifier
     buffer = builder.Output()
     buffer[4:8] = FILE_IDENTIFIER
-    return buffer
+    return bytes(buffer)

streaming_data_types/logdata_f142.py

@@ -158,7 +158,7 @@ def _complete_buffer(
     timestamp_unix_ns: int,
     alarm_status: Union[int, None] = None,
     alarm_severity: Union[int, None] = None,
-) -> bytearray:
+) -> bytes:
     LogData.LogDataAddTimestamp(builder, timestamp_unix_ns)
 
     if alarm_status is not None:
@@ -171,7 +171,7 @@ def _complete_buffer(
     builder.Finish(log_msg)
     buff = builder.Output()
     buff[4:8] = FILE_IDENTIFIER
-    return buff
+    return bytes(buff)
 
 
 def _setup_builder(source_name: str) -> Tuple[flatbuffers.Builder, int]: