Merge pull request #140 from mcci-catena/issue139

Fix #139: changed the SubBand of Helium US 915 to SubBand_2

Author: terrillmoore

README.md

@@ -106,7 +106,7 @@ The following compile-time defines select the network that will be used. Exactly
 |---------------------------------------|-----------------------|--------------
 | `ARDUINO_LMIC_CFG_NETWORK_TTN`        | The Things Network    | EU868, US915 (subband 1), AU915 (subband 1), AS923, AS923 Japan, KR920, IN866
 | `ARDUINO_LMIC_CFG_NETWORK_ACTILITY`   | Actility              | EU868, US915, AU915, AS923, AS923 Japan, KR920, IN866
-| `ARDUINO_LMIC_CFG_NETWORK_HELIUM`     | Helium                | US915 (subband 6)
+| `ARDUINO_LMIC_CFG_NETWORK_HELIUM`     | Helium                | US915 (subband 1)
 | `ARDUINO_LMIC_CFG_NETWORK_MACHINEQ`   | machineQ              | US915
 | `ARDUINO_LMIC_CFG_NETWORK_SENET`      | Senet                 | US915
 | `ARDUINO_LMIC_CFG_NETWORK_SENRA`      | Senra                 | IN866

src/lib/helium_us915_netbeginregioninit.cpp

@@ -43,10 +43,10 @@ Copyright notice:
 void Arduino_LoRaWAN_Helium_us915::NetBeginRegionInit()
     {
     //
-    // Helium is an 8-channel network on subband 6 of [0..7]. Pre-join
-    // we therefore want to limit to probing channels 48~55 / 70.
+    // Helium is an 8-channel network on subband 1 of [0..7]. Pre-join
+    // we therefore want to limit to probing channels 8~15 / 65.
     //
-    cLMIC::SelectSubBand(cLMIC::SubBand::SubBand_7);
+    cLMIC::SelectSubBand(cLMIC::SubBand::SubBand_2);
 
     //
     // Set data rate and transmit power -- these ought to