diff --git a/modem/arq_session.py b/modem/arq_session.py
index bbb13403..aecc4537 100644
--- a/modem/arq_session.py
+++ b/modem/arq_session.py
@@ -1,6 +1,7 @@
 import queue, threading
 from codec2 import FREEDV_MODE
 import data_frame_factory
+import structlog
 
 class ARQSession():
 
@@ -11,6 +12,7 @@ class ARQSession():
     ]
 
     def __init__(self, config: dict, tx_frame_queue: queue.Queue, dxcall: str):
+        self.logger = structlog.get_logger(type(self).__name__)
         self.config = config
 
         self.dxcall = dxcall
@@ -34,3 +36,6 @@ class ARQSession():
         }
         self.tx_frame_queue.put(modem_queue_item)
 
+    def setState(self, state):
+        self.state = state
+        self.logger.info(f"state changed to {state}")
diff --git a/modem/arq_session_iss.py b/modem/arq_session_iss.py
index cc445beb..c44cd396 100644
--- a/modem/arq_session_iss.py
+++ b/modem/arq_session_iss.py
@@ -77,10 +77,10 @@ class ARQSessionISS(arq_session.ARQSession):
     # Sends the full payload in multiple frames
     def send_data(self):
         offset = 0
-        while offset < len(self.payload):
+        while offset < len(self.data):
             max_size = self.get_max_size_for_speed_level(self.speed_level)
-            end_offset = min(len(self.payload), max_size)
-            frame_payload = self.payload[offset:end_offset]
+            end_offset = min(len(self.data), max_size)
+            frame_payload = self.data[offset:end_offset]
             data_frame = self.frame_factory.build_arq_session_send(self.speed_level, 
                                                                    self.dxcall, 
                                                                    frame_payload)
diff --git a/modem/data_frame_factory.py b/modem/data_frame_factory.py
index 8165e254..6c328672 100644
--- a/modem/data_frame_factory.py
+++ b/modem/data_frame_factory.py
@@ -201,7 +201,7 @@ class DataFrameFactory:
                 elif key == "gridsquare":
                     extracted_data[key] = helpers.decode_grid(data)
 
-                elif key == "session_id":
+                elif key in ["session_id", "speed_level"]:
                     extracted_data[key] = int.from_bytes(data, 'big')
 
                 else:
diff --git a/modem/frame_handler_arq.py b/modem/frame_handler_arq.py
index 85f90102..c811e1a0 100644
--- a/modem/frame_handler_arq.py
+++ b/modem/frame_handler_arq.py
@@ -4,6 +4,7 @@ from event_manager import EventManager
 from state_manager import StateManager
 from modem_frametypes import FRAME_TYPE as FR
 from arq_session_irs import ARQSessionIRS
+from arq_session_iss import ARQSessionISS
 
 class ARQFrameHandler(frame_handler.FrameHandler):
 
@@ -17,3 +18,8 @@ class ARQFrameHandler(frame_handler.FrameHandler):
                                     frame['origin'], frame['session_id'])
             self.states.register_arq_irs_session(session)
             session.run()
+
+        # ARQ session open ack received
+        if frame['frame_type_int'] in [FR.ARQ_DC_OPEN_ACK_N.value, FR.ARQ_DC_OPEN_ACK_W.value]:
+            iss_session:ARQSessionISS = self.states.get_arq_iss_session(frame['session_id'])
+            iss_session.on_connection_ack_received(frame)
diff --git a/modem/state_manager.py b/modem/state_manager.py
index ba61fe33..f59cab10 100644
--- a/modem/state_manager.py
+++ b/modem/state_manager.py
@@ -127,10 +127,12 @@ class StateManager:
     def get_arq_iss_session(self, id):
         if id not in self.arq_iss_sessions:
             raise RuntimeError(f"ARQ ISS Session '{id}' not found!")
+        return self.arq_iss_sessions[id]
 
     def get_arq_irs_session(self, id):
         if id not in self.arq_irs_sessions:
             raise RuntimeError(f"ARQ IRS Session '{id}' not found!")
+        return self.arq_irs_sessions[id]
 
     def remove_arq_iss_session(self, id):
         if id not in self.arq_iss_sessions: