feat(observer): add observer mode and disconnect recovery

components/maze32_lobby/maze32_protocol.c

@@ -123,6 +123,15 @@ static int payload_field_allowed(maze32_message_type_t type, const char* key, ch
         *fields |= 1U;
         return 1;
     }
+    if (type == MAZE32_MESSAGE_MOVE && strcmp(key, "direction") == 0 && !(*fields & 1U)) {
+        if (strcmp(value, "north") != 0 && strcmp(value, "east") != 0 &&
+            strcmp(value, "south") != 0 && strcmp(value, "west") != 0) {
+            return 0;
+        }
+        memcpy(message->direction, value, strlen(value) + 1U);
+        *fields |= 1U;
+        return 1;
+    }
     return 0;
 }
 
@@ -159,6 +168,9 @@ static int parse_payload(json_cursor_t* cursor, maze32_client_message_t* message
     if (message->type == MAZE32_MESSAGE_RESTORE) {
         return fields == 1U;
     }
+    if (message->type == MAZE32_MESSAGE_MOVE) {
+        return fields == 1U;
+    }
     return fields == 0U;
 }
 
@@ -172,6 +184,12 @@ static maze32_message_type_t message_type(const char* value) {
     if (strcmp(value, "start") == 0) {
         return MAZE32_MESSAGE_START;
     }
+    if (strcmp(value, "move") == 0) {
+        return MAZE32_MESSAGE_MOVE;
+    }
+    if (strcmp(value, "drop_key") == 0) {
+        return MAZE32_MESSAGE_DROP_KEY;
+    }
     if (strcmp(value, "heartbeat") == 0) {
         return MAZE32_MESSAGE_HEARTBEAT;
     }