Add get/set dutycycle command

We translate to af internally, it's easier to store and doesn't break
stored prefs. Made get/set af command show deprecated, but it still
works fine.

docs/cli_commands.md

@@ -500,20 +500,22 @@ This document provides an overview of CLI commands that can be sent to MeshCore
 
 ---
 
-#### View or change the airtime factor (duty cycle limit)
+#### View or change the duty cycle limit
 **Usage:**
-- `get af`
-- `set af <value>`
+- `get dutycycle`
+- `set dutycycle <value>`
 
 **Parameters:**
-- `value`: Airtime factor (0-9). After each transmission, the repeater enforces a silent period of approximately the on-air transmission time multiplied by the value. This results in a long-term duty cycle of roughly 1 divided by (1 plus the value). For example:
-  - `af = 1` → ~50% duty
-  - `af = 2` → ~33% duty
-  - `af = 3` → ~25% duty
-  - `af = 9` → ~10% duty  
-  Yyou are responsible for choosing a value that is appropriate for your jurisdiction and channel plan (for example EU 868 Mhz 10% duty cycle regulation).
+- `value`: Duty cycle percentage (10-100)
 
-**Default:** `1.0`
+**Default:** `50%` (equivalent to airtime factor 1.0)
+
+**Examples:**
+- `set dutycycle 100` — no duty cycle limit
+- `set dutycycle 50` — 50% duty cycle (default)
+- `set dutycycle 10` — 10% duty cycle (strictest EU requirement)
+
+> **Deprecated:** `get af` / `set af` still work but are deprecated in favour of `dutycycle`.
 
 ---
 

docs/terminal_chat_cli.md

@@ -28,9 +28,11 @@ set lon {longitude}
 Sets your advertisement map longitude. (decimal degrees)
 
 ```
-set af {air-time-factor}
+set dutycycle {percent}
 ```
-Sets the transmit air-time-factor.
+Sets the transmit duty cycle limit (10-100%). Example: `set dutycycle 10` for 10%.
+
+> **Deprecated:** `set af` still works but is deprecated in favour of `set dutycycle`.
 
 
 ```

src/helpers/CommonCLI.cpp

@@ -294,8 +294,13 @@ void CommonCLI::handleCommand(uint32_t sender_timestamp, const char* command, ch
      */
     } else if (memcmp(command, "get ", 4) == 0) {
       const char* config = &command[4];
-      if (memcmp(config, "af", 2) == 0) {
-        sprintf(reply, "> %s", StrHelper::ftoa(_prefs->airtime_factor));
+      if (memcmp(config, "dutycycle", 8) == 0) {
+        float dc = 100.0f / (_prefs->airtime_factor + 1.0f);
+        int dc_int = (int)dc;
+        int dc_frac = (int)((dc - dc_int) * 10.0f + 0.5f);
+        sprintf(reply, "> %d.%d%%", dc_int, dc_frac);
+      } else if (memcmp(config, "af", 2) == 0) {
+        sprintf(reply, "> %s (deprecated, use 'get dutycycle')", StrHelper::ftoa(_prefs->airtime_factor));
       } else if (memcmp(config, "int.thresh", 10) == 0) {
         sprintf(reply, "> %d", (uint32_t) _prefs->interference_threshold);
       } else if (memcmp(config, "agc.reset.interval", 18) == 0) {
@@ -451,10 +456,25 @@ void CommonCLI::handleCommand(uint32_t sender_timestamp, const char* command, ch
      */
     } else if (memcmp(command, "set ", 4) == 0) {
       const char* config = &command[4];
-      if (memcmp(config, "af ", 3) == 0) {
+      if (memcmp(config, "dutycycle ", 9) == 0) {
+        float dc = atof(&config[9]);
+        if (dc < 10 || dc > 100) {
+          strcpy(reply, "ERROR: dutycycle must be 10-100");
+        } else {
+          _prefs->airtime_factor = (100.0f / dc) - 1.0f;
+          savePrefs();
+          float actual = 100.0f / (_prefs->airtime_factor + 1.0f);
+          int a_int = (int)actual;
+          int a_frac = (int)((actual - a_int) * 10.0f + 0.5f);
+          sprintf(reply, "OK - %d.%d%%", a_int, a_frac);
+        }
+      } else if (memcmp(config, "af ", 3) == 0) {
         _prefs->airtime_factor = atof(&config[3]);
         savePrefs();
-        strcpy(reply, "OK");
+        float actual = 100.0f / (_prefs->airtime_factor + 1.0f);
+        int a_int = (int)actual;
+        int a_frac = (int)((actual - a_int) * 10.0f + 0.5f);
+        sprintf(reply, "OK - %d.%d%% (deprecated, use 'set dutycycle')", a_int, a_frac);
       } else if (memcmp(config, "int.thresh ", 11) == 0) {
         _prefs->interference_threshold = atoi(&config[11]);
         savePrefs();