TCLK cannot be read on Z-Stack Home 1.2, only written

Author: puddly

zigpy_znp/api.py

@@ -147,24 +147,19 @@ async def load_network_info(self, *, load_devices=False):
                 partner_ieee=node_info.ieee,
             ),
             tc_link_key=zigpy.state.Key(
-                key=None,
+                key=const.DEFAULT_TC_LINK_KEY,
                 seq=0,
                 tx_counter=0,
                 rx_counter=0,
-                partner_ieee=None,
+                partner_ieee=t.EUI64.convert("FF:FF:FF:FF:FF:FF:FF:FF"),
             ),
             children=[],
             nwk_addresses={},
             key_table=[],
-            stack_specific=None,
+            stack_specific={},
         )
 
-        if self.version == 1.2:
-            tc_link_key = await self.nvram.osal_read(
-                OsalNvIds.TCLK_SEED, item_type=t.TCLinkKey
-            )
-            network_info.tc_link_key.key = tc_link_key.key
-        else:
+        if self.version > 1.2:
             tclk_seed = await self.nvram.osal_read(
                 OsalNvIds.TCLK_SEED, item_type=t.KeyData
             )
@@ -374,12 +369,15 @@ async def write_network_info(
             # TCLK_SEED is TCLK_TABLE_START in Z-Stack 1
             nvram[OsalNvIds.TCLK_SEED] = t.TCLinkKey(
                 ExtAddr=t.EUI64.convert("FF:FF:FF:FF:FF:FF:FF:FF"),  # global
-                Key=network_info.tc_link_key.key,
+                Key=network_info.tc_link_key.key or const.DEFAULT_TC_LINK_KEY,
                 TxFrameCounter=0,
                 RxFrameCounter=0,
             )
         else:
-            if network_info.tc_link_key.key != const.DEFAULT_TC_LINK_KEY:
+            if (
+                network_info.tc_link_key is not None
+                and network_info.tc_link_key.key != const.DEFAULT_TC_LINK_KEY
+            ):
                 LOGGER.warning(
                     "TC link key is configured at build time in Z-Stack 3 and cannot be"
                     " changed at runtime: %s",

zigpy_znp/tools/network_restore.py

@@ -7,6 +7,7 @@
 import zigpy.state
 import zigpy.zdo.types as zdo_t
 
+import zigpy_znp.const as const
 import zigpy_znp.types as t
 from zigpy_znp.api import ZNP
 from zigpy_znp.tools.common import ClosableFileType, setup_parser, validate_backup_json
@@ -38,7 +39,7 @@ def json_backup_to_zigpy_state(
     network_info.channel_mask = t.Channels.from_channel_list(backup["channel_mask"])
     network_info.security_level = backup["security_level"]
     network_info.stack_specific = backup.get("stack_specific")
-    network_info.tc_link_key = None
+    network_info.tc_link_key.key = const.DEFAULT_TC_LINK_KEY
 
     network_info.network_key = zigpy.state.Key()
     network_info.network_key.key, _ = t.KeyData.deserialize(