say ok on login, not x

xrd.py

@@ -67,7 +67,6 @@ def authenticate(conn: socket.socket):
     salt = "".join(secrets.choice(string.ascii_lowercase) for _ in range(SALT_LENGTH))
     conn.sendall(salt.encode() + b"\n")
     expected_hash = hashlib.sha1((salt + PASSWORD).encode()).hexdigest().encode()
-    tries = 0
 
     while True:
         try:
@@ -75,15 +74,13 @@ def authenticate(conn: socket.socket):
             if not data: break
 
             if data.strip() == expected_hash.strip(): 
-                conn.sendall(b"o1,0\n")
+                conn.sendall(b"o1,0\nOK\n")
                 return True
             else: 
-                tries += 1
                 conn.sendall(b"a0\n") # You failed
-        except BlockingIOError:
-            if tries > 2: 
-                conn.close()
                 break
+        except BlockingIOError: pass
+    conn.close()
     return False
 
 def process_command(tef: TEF6686, data: bytes, state: State, conn: socket.socket):
@@ -103,17 +100,15 @@ def process_command(tef: TEF6686, data: bytes, state: State, conn: socket.socket
             out += f"G{bin(eqims).removeprefix('0b').zfill(2)}\n".encode()
             state.last_eqims = eqims
         elif cmd.startswith(b"B"):
-            mono = bool(int(cmd.decode().removeprefix("B").strip(), 2))
-            tef.FM_Set_Stereo_Min(2 if mono else 0)
-            out += f"B{int(mono)}\n".encode()
-            state.forced_mono = mono
+            state.forced_mono = bool(int(cmd.decode().removeprefix("B").strip(), 2))
+            tef.FM_Set_Stereo_Min(2 if state.forced_mono else 0)
+            out += f"B{int(state.forced_mono)}\n".encode()
         elif cmd.startswith(b"D"):
             state.deemp = int(cmd.decode().removeprefix("D").strip())
             dtime = 500 if state.deemp == 0 else (750 if state.deemp == 1 else 0)
             tef.FM_Set_Deemphasis(dtime)
             out += f"D{state.deemp}\n".encode()
         elif cmd.startswith(b"x"):
-            out += b"OK\n"
             tef.APPL_Set_OperationMode(False) # Enable
             tef.FM_Tune_To(TEF6686.TuneTo_Mode.Preset, state.last_tune)
         elif cmd.startswith(b"X"): tef.APPL_Set_OperationMode(True) # turn off
@@ -122,10 +117,10 @@ def process_command(tef: TEF6686, data: bytes, state: State, conn: socket.socket
             auto = (state.bw == 0)
             tef.FM_Set_Bandwidth(auto, 2360 if auto else (state.bw // 100))
             out += f"W{state.bw}\n".encode()
-        elif cmd.startswith(b"?"): out += b".XRD Python driver\n"
+        elif cmd.startswith(b"?"): out += b">XRD Python driver\n"
         elif cmd.startswith(b"S"):
             cmd = cmd[1:]
-            if cmd != b"":
+            if cmd.strip():
                 arg = int(cmd.decode()[1:].strip())
                 match cmd[0]:
                     case 97: state.scan_start = (arg + 5) // 10