use encodeToByteArray / decodeToString methods

app/src/main/java/com/geeksville/mesh/DataPacket.kt

@@ -4,8 +4,6 @@ import android.os.Parcel
 import android.os.Parcelable
 import kotlinx.parcelize.Parcelize
 import kotlinx.serialization.Serializable
-import java.nio.charset.Charset
-
 
 @Parcelize
 enum class MessageStatus : Parcelable {
@@ -43,7 +41,7 @@ data class DataPacket(
      */
     constructor(to: String?, channel: Int, text: String) : this(
         to = to,
-        bytes = text.toByteArray(utf8),
+        bytes = text.encodeToByteArray(),
         dataType = Portnums.PortNum.TEXT_MESSAGE_APP_VALUE,
         channel = channel
     )
@@ -53,7 +51,7 @@ data class DataPacket(
      */
     val text: String?
         get() = if (dataType == Portnums.PortNum.TEXT_MESSAGE_APP_VALUE)
-            bytes?.toString(utf8)
+            bytes?.decodeToString()
         else
             null
 
@@ -159,7 +157,5 @@ data class DataPacket(
         override fun newArray(size: Int): Array<DataPacket?> {
             return arrayOfNulls(size)
         }
-
-        val utf8: Charset = Charset.forName("UTF-8")
     }
 }

app/src/main/java/com/geeksville/mesh/MainActivity.kt

@@ -52,7 +52,6 @@ import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.Job
 import kotlinx.coroutines.cancel
-import java.nio.charset.Charset
 import java.text.DateFormat
 import java.util.Date
 import javax.inject.Inject
@@ -106,8 +105,6 @@ eventually:
   make a custom theme: https://github.com/material-components/material-components-android/tree/master/material-theme-builder
 */
 
-val utf8: Charset = Charset.forName("UTF-8")
-
 @AndroidEntryPoint
 class MainActivity : BaseActivity(), Logging {
 

app/src/main/java/com/geeksville/mesh/service/MeshService.kt

@@ -211,7 +211,7 @@ class MeshService : Service(), Logging {
 
     private fun updateMessageNotification(message: DataPacket) =
         serviceNotifications.updateMessageNotification(
-            getSenderName(message), message.bytes!!.toString(utf8)
+            getSenderName(message), message.bytes!!.decodeToString()
         )
 
     /**