Seed socket payloads with opt (communicate factory) + host_probe4

tests/test_protocol.py

@@ -81,30 +81,28 @@ class TestEnvelope(unittest.TestCase):
              "crc", "dataArea"],
         )
         self.assertNotIn("data", d)
+        # socket payload is always seeded with the operation type first
+        self.assertEqual(d["dataArea"], {"opt": 0, "update": 2})
 
-    def test_no_data_means_seven_keys(self):
+    def test_no_data_still_carries_opt(self):
         env = direct_connect_request(CommunicationCmd.BMS, SN, data=None)
         d = env.to_dict()
-        self.assertEqual(
-            list(d),
-            ["cmdType", "equipNo", "type", "timeStamp", "snno", "len", "crc"],
-        )
-        self.assertEqual(env.length, 0)
-        self.assertEqual(env.crc, "")
+        self.assertIn("dataArea", d)
+        self.assertEqual(d["dataArea"], {"opt": 0})
+        self.assertEqual(env.length, len(b'{"opt":0}'))
+        self.assertTrue(env.crc)
 
-    def test_empty_map_means_no_data_area(self):
+    def test_empty_map_still_carries_opt(self):
         env = direct_connect_request(CommunicationCmd.BMS, SN, data={})
-        self.assertNotIn("dataArea", env.to_dict())
-        self.assertEqual(env.length, 0)
-        self.assertEqual(env.crc, "")
+        self.assertEqual(env.to_dict()["dataArea"], {"opt": 0})
 
     def test_len_crc_auto_uppercase(self):
         env = direct_connect_request(
             CommunicationCmd.DEVICE_APOWER_INFO, SN, data={"update": 2})
-        self.assertEqual(env.length, len(b'{"update":2}'))
+        self.assertEqual(env.length, len(b'{"opt":0,"update":2}'))
         import zlib
         self.assertEqual(
-            env.crc, format(zlib.crc32(b'{"update":2}'), "X"))
+            env.crc, format(zlib.crc32(b'{"opt":0,"update":2}'), "X"))
         self.assertEqual(env.crc, env.crc.upper())
 
     def test_int_fields(self):