Added comments about tuya protocol

tuya.cpp

@@ -1,6 +1,25 @@
 #include "espMQTT.h"
 #include "tuya.h"
 
+/* https://images.tuyacn.com/smart/aircondition/Guide-to-Interworking-with-the-Tuya-MCU.pdf  
+ * Tuyapacket with DP command = 0x55, 0xAA, VERSION, COMMAND, 0x00, LENGTH, DPID, DATA TYPE, FUNCTION LENGTH, FUCTION DATA
+ *
+ * COMMAND
+ * 0x00 Heartbeat detection.
+ * 0x01 Query product information.
+ * 0x02 Query the working mode of the Wi-Fi module.
+ * 0x03 Report the network connection status of the device.
+ * 0x04 Reset the Wi-Fi module and switch the network configuration mode.
+ * 0x05 Reset the Wi-Fi module and select a network configuration mode.
+ * 0x06 Deliver DP commands.
+ * 0x07 Report DP status.
+ * 0x08 Query the device initialization status.
+ * 0x0a (Optional) Start OTA upgrade.
+ * 0x0b (Optional) Transmit the OTA upgrade package.
+ * 0x1c (Optional) Obtain the local time.
+ * 0x0e Test the Wi-Fi function (product testing command).
+ */
+
 static uint8_t tuya_dimvalue0 = 0;
 static uint8_t tuya_dimvalue1 = 0;
 static uint8_t tuya_dimstate0 = 0;