Add factory reset functionality

CHANGELOG.md

@@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 
 ### Added
 - `Rn2903::system_version_bytes()`
+- `Rn2903::system_factory_reset()`
 
 ### Changed
 

src/lib.rs

@@ -293,4 +293,12 @@ impl Rn2903 {
     pub fn system_version_bytes(&mut self) -> Result<Vec<u8>> {
         self.transact(b"sys get ver")
     }
+
+    /// Performs a factory reset on the connected module. All EEPROM values are
+    /// restored to factory defaults. All LoRaWAN settings set by the user are lost.
+    /// Returns the system version, like `::system_version_bytes()`.
+    pub fn system_factory_reset(&mut self) -> Result<String> {
+        let bytes = self.transact(b"sys factoryRESET")?;
+        Ok(bytes_to_string(&bytes))
+    }
 }