I made a few tests before working and i share my conclusion to make it easier for you:
The code for receiver should be configured like this:
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#define SERIAL_BAUD_RATE 115200 //115.200 baud serial port speed
//###### TELEMETRY MODES ########
#define TELEMETRY_ENABLED 1 // 1 = Enabled(bidirectional mode) 0 = Disabled(unidirectional mode)
#define TELEMETRY_MODE 0 // 0 = Transparent Bridge(750 byte/second max.) // 1 = Standard OpenLRS Telemetry
//#define Serial_RSSI //Serial RSSI value for analyzing
The code for transmitter should be configured like this:
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//###### SERIAL PORT SPEED #######
#define SERIAL_BAUD_RATE 115200 //115.200 baud serial port speed
//###### TELEMETRY MODES ########
#define TELEMETRY_ENABLED 1 // 1 = Enabled(bidirectional mode) 0 = Disabled(unidirectional mode)
#define TELEMETRY_MODE 0 // 0 = Transparent Bridge(750 byte/second max) // 1 = Standard OpenLRS Telemetry
#define TELEMETRY_OUTPUT_ENABLED 1 // 1 = Enabled 0 = Disabled //Enables the Serial Telemetry Data Output. If you need only Buzzer alerts, disable it for less processing time.
To check the functionality, connect the computer to transmitter serial interface (Rx-to-Tx) and start HyperTerminal from Programs-Accessories-Communication. Then configure the link as follows: select the COM port, configure it to 115200 baud, 8 bits, parity none, stop bits 1 , software flow control.
Then go to receiver and make a loop (a wire) between RX and TX pin.
Now when you press a key in HyperTerminal, the character goes wireless to receiver and then receiver through loop wire send it back to transmitter and you will see it on the HT screen as an echo. If you disconnect the loop wire, the character you sent won't be visible as an echo anymore.
hint: Having a LED near you helps you find the TX witch lights the led. So connect the wire witch lights the led (TX) with the one who don't (RX), RX-to-TX. The longer pin of the led connects to positive/TX and shorter to ground.
GOOD LUCK!
Now i am working to implement the serial wireless communication between multicopter Multiwii board and GUI. I reached a dead end because the RX and TX of arduino mega board are hardware connected to embeded ftdi witch is driving the signals.
Please share your work here as i do.