change example FSK settings to more sensible values, set Variable packet type as default for FSK and MSK

examples/stm32wle5jc/src/bin/fsk_rx.rs

@@ -37,8 +37,8 @@ async fn main(_spawner: Spawner) {
     fsk.configure(&FskConfig {
         frequency: 868_100_000,
         bitrate: Bitrate::Custom(600),
-        fdev: FreqDev::Hz(32_000),
-        bandwidth: Bandwidth::Bw78_2kHz, // >= 2 * (32000 + 600/2) = 64.6 kHz
+        fdev: FreqDev::Hz(380),
+        bandwidth: Bandwidth::Bw4_8kHz, // >= 2 * (380 + 600/2) = 1.36kHz
         pa: PaSelection::HighPower,
         power_dbm: 22,
         ..Default::default()

examples/stm32wle5jc/src/bin/fsk_tx.rs

@@ -37,7 +37,7 @@ async fn main(_spawner: Spawner) {
     fsk.configure(&FskConfig {
         frequency: 868_100_000,
         bitrate: Bitrate::Custom(600),
-        fdev: FreqDev::Hz(32_000),
+        fdev: FreqDev::Hz(380),
         pa: PaSelection::HighPower,
         power_dbm: 22,
         ..Default::default()

src/modulations/fsk.rs

@@ -178,7 +178,7 @@ impl Default for FskConfig {
             // default values taken from RF0461 reference manual
             sync_word: [0x97, 0x23, 0x52, 0x25, 0x56, 0x53, 0x65, 0x64],
             addr_comp: AddrComp::Off,
-            packet_type: PacketLengthType::Fixed,
+            packet_type: PacketLengthType::Variable,
             crc: CrcType::Crc2Byte,
             whitening: true,
             rx_gain: RxGain::Boosted,

src/modulations/msk.rs

@@ -60,7 +60,7 @@ impl Default for MskConfig {
             // default values taken from RF0461 reference manual
             sync_word: [0x97, 0x23, 0x52, 0x25, 0x56, 0x53, 0x65, 0x64],
             addr_comp: AddrComp::Off,
-            packet_type: PacketLengthType::Fixed,
+            packet_type: PacketLengthType::Variable,
             crc: CrcType::Crc2Byte,
             whitening: true,
             rx_gain: RxGain::Boosted,