feat: add `DeviceConfig` Role descriptions

closes #848

app/src/main/java/com/geeksville/mesh/ui/components/config/DeviceConfigItemList.kt

@@ -12,10 +12,12 @@ import androidx.compose.runtime.saveable.rememberSaveable
 import androidx.compose.runtime.setValue
 import androidx.compose.ui.Modifier
 import androidx.compose.ui.platform.LocalFocusManager
+import androidx.compose.ui.res.stringResource
 import androidx.compose.ui.text.input.ImeAction
 import androidx.compose.ui.text.input.KeyboardType
 import androidx.compose.ui.tooling.preview.Preview
 import com.geeksville.mesh.ConfigProtos.Config.DeviceConfig
+import com.geeksville.mesh.R
 import com.geeksville.mesh.copy
 import com.geeksville.mesh.ui.components.DropDownPreference
 import com.geeksville.mesh.ui.components.EditTextPreference
@@ -23,6 +25,22 @@ import com.geeksville.mesh.ui.components.PreferenceCategory
 import com.geeksville.mesh.ui.components.PreferenceFooter
 import com.geeksville.mesh.ui.components.SwitchPreference
 
+private val  DeviceConfig.Role.stringRes: Int
+    get() = when (this) {
+        DeviceConfig.Role.CLIENT -> R.string.role_client
+        DeviceConfig.Role.CLIENT_MUTE -> R.string.role_client_mute
+        DeviceConfig.Role.ROUTER -> R.string.role_router
+        DeviceConfig.Role.ROUTER_CLIENT -> R.string.role_router_client
+        DeviceConfig.Role.REPEATER -> R.string.role_repeater
+        DeviceConfig.Role.TRACKER -> R.string.role_tracker
+        DeviceConfig.Role.SENSOR -> R.string.role_sensor
+        DeviceConfig.Role.TAK -> R.string.role_tak
+        DeviceConfig.Role.CLIENT_HIDDEN -> R.string.role_client_hidden
+        DeviceConfig.Role.LOST_AND_FOUND -> R.string.role_lost_and_found
+        DeviceConfig.Role.TAK_TRACKER -> R.string.role_tak_tracker
+        else -> R.string.unrecognized
+    }
+
 @Composable
 fun DeviceConfigItemList(
     deviceConfig: DeviceConfig,
@@ -39,6 +57,7 @@ fun DeviceConfigItemList(
 
         item {
             DropDownPreference(title = "Role",
+                summary = stringResource(id = deviceInput.role.stringRes),
                 enabled = enabled,
                 items = DeviceConfig.Role.entries
                     .filter { it != DeviceConfig.Role.UNRECOGNIZED }

app/src/main/res/values/strings.xml

@@ -43,6 +43,18 @@
     <string name="routing_error_pki_failed">Encrypted Send Failed</string>
     <string name="routing_error_pki_unknown_pubkey">Unknown Public Key</string>
 
+    <string name="role_client">App connected or standalone messaging device.</string>
+    <string name="role_client_mute">Device that does not forward packets from other devices.</string>
+    <string name="role_router">Infrastructure node for extending network coverage by relaying messages. Visible in nodes list.</string>
+    <string name="role_router_client">Combination of both ROUTER and CLIENT. Not for mobile devices.</string>
+    <string name="role_repeater">Infrastructure node for extending network coverage by relaying messages with minimal overhead. Not visible in nodes list.</string>
+    <string name="role_tracker">Broadcasts GPS position packets as priority.</string>
+    <string name="role_sensor">Broadcasts telemetry packets as priority.</string>
+    <string name="role_tak">Optimized for ATAK system communication, reduces routine broadcasts.</string>
+    <string name="role_client_hidden">Device that only broadcasts as needed for stealth or power savings.</string>
+    <string name="role_lost_and_found">Broadcasts location as message to default channel regularly for to assist with device recovery.</string>
+    <string name="role_tak_tracker">Enables automatic TAK PLI broadcasts and reduces routine broadcasts.</string>
+
     <string name="elevation_suffix" translatable="false">MSL</string>
     <string name="channel_air_util" translatable="false">ChUtil %.1f%% AirUtilTX %.1f%%</string>