diff --git a/common.py b/common.py
index 429f31d..4b70aae 100644
--- a/common.py
+++ b/common.py
@@ -33,6 +33,7 @@ from tmtccmd.cfdp.user import (
     TransactionFinishedParams,
 )
 from tmtccmd.config.args import ProcedureParamsWrapper
+from tmtccmd.core import BackendState
 from tmtccmd.logging import get_current_time_string
 from tmtccmd.pus.pus_11_tc_sched import Subservices as Pus11Subservices
 from tmtccmd.tc.queue import DefaultPusQueueHelper
@@ -68,7 +69,13 @@ from examples.tmtcc import (
     CFDP_LOCAL_ENTITY_ID,
     CFDP_REMOTE_ENTITY_ID,
 )
-from tmtccmd import TcHandlerBase, get_console_logger, TmTcCfgHookBase, BackendBase
+from tmtccmd import (
+    TcHandlerBase,
+    get_console_logger,
+    TmTcCfgHookBase,
+    BackendBase,
+    CcsdsTmtcBackend,
+)
 from tmtccmd.pus import VerificationWrapper
 from tmtccmd.tc import (
     ProcedureWrapper,
@@ -455,9 +462,7 @@ class TcHandler(TcHandlerBase):
                     pdu_holder,
                     packet,
                 ) = self.cfdp_in_ccsds_wrapper.pull_next_source_packet()
-                self.queue_helper.add_log_cmd(
-                    f"CFDP Source: Sending EOF PDU"
-                )
+                self.queue_helper.add_log_cmd(f"CFDP Source: Sending EOF PDU")
                 self.queue_helper.add_ccsds_tc(packet)
 
                 self.cfdp_in_ccsds_wrapper.confirm_source_packet_sent()
@@ -502,6 +507,7 @@ class TcHandler(TcHandlerBase):
             elif info.proc_type == TcProcedureType.CFDP:
                 LOGGER.info(f"Finished CFDP queue")
 
+
 def setup_params(hook_obj: TmTcCfgHookBase) -> SetupWrapper:
     print(f"-- eive TMTC Commander --")
     print(f"-- spacepackets v{spacepackets.__version__} --")
@@ -583,7 +589,7 @@ def setup_backend(
     setup_wrapper: SetupWrapper,
     tc_handler: TcHandler,
     ccsds_handler: CcsdsTmHandler,
-) -> BackendBase:
+) -> CcsdsTmtcBackend:
     init_proc = params_to_procedure_conversion(setup_wrapper.proc_param_wrapper)
     tmtc_backend = tmtccmd.create_default_tmtc_backend(
         setup_wrapper=setup_wrapper,
@@ -592,4 +598,4 @@ def setup_backend(
         init_procedure=init_proc.base,
     )
     tmtccmd.start(tmtc_backend=tmtc_backend, hook_obj=setup_wrapper.hook_obj)
-    return tmtc_backend
+    return cast(CcsdsTmtcBackend, tmtc_backend)