Merge pull request #993 from recrof/allow_lower_bw_sf

allow saving spreading factor from 5 and bandwidth from 7.8kHz

examples/companion_radio/MyMesh.cpp

@@ -706,8 +706,8 @@ void MyMesh::begin(bool has_display) {
   _prefs.rx_delay_base = constrain(_prefs.rx_delay_base, 0, 20.0f);
   _prefs.airtime_factor = constrain(_prefs.airtime_factor, 0, 9.0f);
   _prefs.freq = constrain(_prefs.freq, 400.0f, 2500.0f);
-  _prefs.bw = constrain(_prefs.bw, 62.5f, 500.0f);
-  _prefs.sf = constrain(_prefs.sf, 7, 12);
+  _prefs.bw = constrain(_prefs.bw, 7.8f, 500.0f);
+  _prefs.sf = constrain(_prefs.sf, 5, 12);
   _prefs.cr = constrain(_prefs.cr, 5, 8);
   _prefs.tx_power_dbm = constrain(_prefs.tx_power_dbm, 1, MAX_LORA_TX_POWER);
 

src/helpers/CommonCLI.cpp

@@ -77,8 +77,8 @@ void CommonCLI::loadPrefsInt(FILESYSTEM* fs, const char* filename) {
     _prefs->direct_tx_delay_factor = constrain(_prefs->direct_tx_delay_factor, 0, 2.0f);
     _prefs->airtime_factor = constrain(_prefs->airtime_factor, 0, 9.0f);
     _prefs->freq = constrain(_prefs->freq, 400.0f, 2500.0f);
-    _prefs->bw = constrain(_prefs->bw, 62.5f, 500.0f);
-    _prefs->sf = constrain(_prefs->sf, 7, 12);
+    _prefs->bw = constrain(_prefs->bw, 7.8f, 500.0f);
+    _prefs->sf = constrain(_prefs->sf, 5, 12);
     _prefs->cr = constrain(_prefs->cr, 5, 8);
     _prefs->tx_power_dbm = constrain(_prefs->tx_power_dbm, 1, 30);
     _prefs->multi_acks = constrain(_prefs->multi_acks, 0, 1);