I have ready made working electronic product. I am applying reverse engineering on it. The WiFi module is connected to micro-controller via UART( RX & TX). The android app sends command to WiFi and micro-controller works as per the command. I have attached a USB to TTL cable on RX and TX also command ground as well of WiFi module. The cable is connected to serial monitor on PC. When the app send data to WiFi, the serial monitor shows Indecipherable value. I have checked every baud rate possible. Instead of USB to TTL cable, I also used HC05 Bluetooth module. But it shows Indecipherable data. How can I get the readable values on my serial monitor. Do i need to disconnect micro controller from WiFi?
No RS232 is used in whole design.
The first two images has similar data but with different baud rate. First image data is set at 4800 and second one at 9600 with No parity, 8 bit data, stop bit 1. "0D" is just enter command( For readability).