* adding new CommonRadioPrefs

* refactor: moving various radio CLI handling to CommonRadioPrefs

src/helpers/CommonRadioPrefs.cpp

@@ -0,0 +1,56 @@
+#include "CommonRadioPrefs.h"
+#include "TxtDataHelpers.h"
+#include "Utils.h"
+
+bool CommonRadioPrefs::handleCommand(const char* command, uint32_t sender_timestamp, char* reply) {
+  if (strcmp(command, "get radio") == 0) {
+    char freq[16], bw[16];
+    strcpy(freq, StrHelper::ftoa(getFreq()));
+    strcpy(bw, StrHelper::ftoa3(getBandwidth()));
+    sprintf(reply, "> %s,%s,%d,%d", freq, bw, (uint32_t)getSpreadFactor(), (uint32_t)getCodingRate());
+    return true;
+  }
+  if (memcmp(command, "set radio ", 10) == 0) {
+    char tmp[132];
+    strcpy(tmp, &command[10]);
+    const char *parts[4];
+    int num = mesh::Utils::parseTextParts(tmp, parts, 4);
+    float freq  = num > 0 ? strtof(parts[0], nullptr) : 0.0f;
+    float bw    = num > 1 ? strtof(parts[1], nullptr) : 0.0f;
+    uint8_t sf  = num > 2 ? atoi(parts[2]) : 0;
+    uint8_t cr  = num > 3 ? atoi(parts[3]) : 0;
+    if (freq >= 150.0f && freq <= 2500.0f && sf >= 5 && sf <= 12 && cr >= 5 && cr <= 8 && bw >= 7.0f && bw <= 500.0f) {
+      setSpreadFactor(sf);
+      setCodingRate(cr);
+      setFreq(freq);
+      setBandwidth(bw);
+      // NOTE: savePrefs() should be handled by caller
+      strcpy(reply, "OK - reboot to apply");
+    } else {
+      strcpy(reply, "Error, invalid radio params");
+    }
+    return true;
+  }
+  if (strcmp(command, "get dutycycle") == 0) {
+    float dc = 100.0f / (getAirtimeFactor() + 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);
+    return true;
+  }
+  if (memcmp(command, "set dutycycle ", 14) == 0) {
+    float dc = atof(&command[14]);
+    if (dc < 1 || dc > 100) {
+      strcpy(reply, "ERROR: dutycycle must be 1-100");
+    } else {
+      setAirtimeFactor((100.0f / dc) - 1.0f);
+      // NOTE: savePrefs() should be handled by caller
+      float actual = 100.0f / (getAirtimeFactor() + 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);
+    }
+    return true;
+  }
+  return false; // not handled
+}