Command Index

FlexRadio Command Reference

This documentation provides comprehensive reference for all FlexRadio API commands discovered from the FlexLib C# API.

This was last refreshed on 12/8/2025 (i.e. SmartSDR v3.1.4)

Warning

This has been generated by AI and accuracy is not guaranteed.

Command Categories

• Amplifier Commands - External hardware amplifier control
• Antenna Commands - Antenna port listing and selection
• ATU Commands - Antenna Tuning Unit control and configuration
• Client Commands - Client connection and session management
• CW Commands - Morse code keying
• CWX Commands - CWX text buffer operations
• Display Commands - Panadapter and waterfall display control
• Equalizer Commands - Audio equalizer and Auto Peak Filter control
• File Commands - File operations including uploads, downloads, and filename management
• Filter Commands - Receiver filter bandwidth control
• Information Commands - Radio information and version queries
• Interlock Commands - Transmit interlock configuration
• Keepalive Commands - Connection keepalive mechanism
• License Commands - Radio license management
• Memory Commands - Memory channel operations
• Meter Commands - Radio meter and measurement access
• Microphone Commands - Microphone management
• Mixer Commands - Mixer management
• MOX Commands - Manual On/Off transmission control
• Ping Commands - Network connectivity testing
• Profile Commands - Profile management
• Radio Commands - Global radio settings and configuration
• Slice Commands - Receiver slice control, tuning, and configuration
• Spot Commands - DX cluster spot management
• Stream Commands - Audio and data stream creation and management
• Subscription Commands - Status update subscriptions
• TNF Commands - Tracking Notch Filter control
• Transmit Commands - RF power, audio processing, and transmission parameters
• Transverter Commands - Transverter configuration
• WAN Commands - Wide Area Network remote access
• Waveform Commands - Waveform management

Command Format

All commands follow the FlexRadio API format:

C[D]<seq_number>|<command> [sub-command] [parameters]

Where:

• C = Command prefix
• D = Optional debug flag
• <seq_number> = Sequence number for command tracking
• <command> = Primary command word
• [sub-command] = Optional sub-command
• [parameters] = Command-specific parameters

Response Format

Responses follow the format:

R<seq_number>|<result_code>|<data>|[debug_info]

Where:

• R = Response prefix
• <seq_number> = Matching sequence number from command
• <result_code> = Result code (0 = success, non-zero = error)
• <data> = Command-specific response data
• [debug_info] = Optional debug information

Response Examples

Successful Commands:

R21|0|2|slice created on 14.230000 MHz        (slice create)
R25|0|14.230000|                              (slice tune)
R33|0|192.168.1.100|                          (client ip)
R26|0||                                       (simple set commands)

Error Responses:

R21|50000001||Unable to create slice
R25|50000004||Invalid frequency parameter
R26|50000016||Malformed command

Common Response Codes

Code	Meaning
0	Success
50000001	Unable to get foundation receiver assignment
50000003	License check failed
50000004	Parameter error
50000005	Incorrect number or type of parameters
50000016	Malformed command
5000002C	Incorrect number of parameters
50000032	Bad mode

Usage Notes

1. Sequence Numbers: Each command should use a unique sequence number to track responses
2. Parameter Format: Most numeric parameters accept ranges as specified in each command
3. String Parameters: String parameters should be quoted when they contain spaces
4. Stream IDs: Display stream IDs are typically in hexadecimal format (e.g., 0x40000000)
5. Frequency Format: Frequencies are specified in MHz with up to 6 decimal places

Command Discovery Source

These commands were extracted from the FlexRadio FlexLib C# API by analyzing:

• SendCommand() method calls for immediate commands
• SendReplyCommand() method calls for commands requiring responses
• Complete analysis of Radio.cs, Slice.cs, and related source files

The documentation represents the complete command set available in the FlexRadio protocol as implemented in the official FlexLib API.