Monitor
The Monitor provides a real-time view of packet traffic on your frequency. Tap Start to begin monitoring. When monitoring is active, you cannot establish a node connection.
Getting Started
TNC Selection
Go to Settings and pair with a TNC to get started.
Frequency Selection
To change the monitoring frequency, tap on the displayed frequency value.
Understanding Frame Display
Monitor Actions
Access additional options by tapping 
(the three-dot menu).
Adjusting Text Size
Select Text Size to increase or decrease the font size for better readability.
Saving Logs
To save the monitor log to a file:
- Select Save to File
- Navigate to your desired folder
- Tap “Move” (iOS treats this as a move operation since you’re moving the temporarily created log to a permanent location)
Note: Logs always contain the complete dump of captured packets. Filters do not affect the saved log content.
Clearing the Display
Use Clear Monitor to reset the monitor screen and start fresh.
Filtering Frames
Control which frames are displayed by tapping 
. When a filter is active and hiding certain frames, the filter icon appears filled 
.
Show Supervisory Frames
Toggle this option to show or hide supervisory frames. Supervisory frames in AX.25 are control frames that manage data flow and error recovery. They handle functions like:
- Acknowledgments
- Polling
- Retransmission requests
These frames don’t carry user data—they only show how each station is managing the connection.
Only Show UI Frames
This toggle displays only UI (Unnumbered Information) frames while hiding everything else. UI frames are connectionless frames used for:
- Broadcasting information
- Simple one-way communication (like APRS or beacons)
- Node presence advertisements and identification
When no other users are actively connecting to a node, UI frames are the best way to determine if a node is present and active.
Search Function
Filter frames by callsign or content by typing text in the search field. The search is case-insensitive and will show only frames that match your criteria.
Display Options
Show Timestamps
Toggle to show or hide timestamps for each frame.
Show Frame Header
Toggle to show or hide the summary information in frame headers.
Show Data as Hex Dump
When frame payloads can’t be decoded as displayable ASCII characters, they’re marked with a DATA indicator. This toggle switches between:
- Off: Simple DATA marker
- On: Full hex dump with partial ASCII representation of displayable characters