1 files changed, 40 insertions, 5 deletions
diff --git a/src/home/mqtt/payload/relay.py b/src/home/mqtt/payload/relay.py
index 2a327ba..debc2c8 100644
--- a/src/home/mqtt/payload/relay.py
+++ b/src/home/mqtt/payload/relay.py
@@ -1,6 +1,10 @@
+import hashlib
+
 from .base_payload import MQTTPayload, MQTTPayloadCustomField
 
 
+# _logger = logging.getLogger(__name__)
+
 class StatFlags(MQTTPayloadCustomField):
     state: bool
     config_changed_value_present: bool
@@ -8,9 +12,11 @@ class StatFlags(MQTTPayloadCustomField):
 
     @staticmethod
     def unpack(flags: int):
+        # _logger.debug(f'StatFlags.unpack: flags={flags}')
         state = flags & 0x1
         ccvp = (flags >> 1) & 0x1
         cc = (flags >> 2) & 0x1
+        # _logger.debug(f'StatFlags.unpack: state={state}')
         return StatFlags(state=(state == 1),
                          config_changed_value_present=(ccvp == 1),
                          config_changed=(cc == 1))
@@ -24,7 +30,7 @@ class StatFlags(MQTTPayloadCustomField):
 
 
 class InitialStatPayload(MQTTPayload):
-    FORMAT = 'IBbIB'
+    FORMAT = '=IBbIB'
 
     ip: int
     fw_version: int
@@ -34,7 +40,7 @@ class InitialStatPayload(MQTTPayload):
 
 
 class StatPayload(MQTTPayload):
-    FORMAT = 'bIB'
+    FORMAT = '=bIB'
 
     rssi: int
     free_heap: int
@@ -42,13 +48,42 @@ class StatPayload(MQTTPayload):
 
 
 class PowerPayload(MQTTPayload):
-    FORMAT = '12sB'
+    FORMAT = '=12sB'
     PACKER = {
-        'state': lambda n: int(n)
+        'state': lambda n: int(n),
+        'secret': lambda s: s.encode('utf-8')
     }
     UNPACKER = {
-        'state': lambda n: bool(n)
+        'state': lambda n: bool(n),
+        'secret': lambda s: s.decode('utf-8')
     }
 
     secret: str
     state: bool
+
+
+class OTAPayload(MQTTPayload):
+    secret: str
+    filename: str
+
+    # structure of returned data:
+    #
+    # uint8_t[len(secret)] secret;
+    # uint8_t[16] md5;
+    # *uint8_t data
+
+    def pack(self):
+        buf = bytearray(self.secret.encode())
+        m = hashlib.md5()
+        with open(self.filename, 'rb') as fd:
+            content = fd.read()
+            m.update(content)
+            buf.extend(m.digest())
+            buf.extend(content)
+        return buf
+
+    def unpack(cls, buf: bytes):
+        raise RuntimeError(f'{cls.__class__.__name__}.unpack: not implemented')
+        # secret = buf[:12].decode()
+        # filename = buf[12:].decode()
+        # return OTAPayload(secret=secret, filename=filename)