Send want_config_id on connect to trigger initial sync (#6)

Send want_config_id on connect to trigger initial sync (#6)

Firmware only streams myInfo/channels/configComplete after receiving a
ToRadio with want_config_id — the service previously wrote nothing on
connect, so /api/channels stayed [] and myNodeNum null. v0.1.4.

src/mesh/codec.ts

@@ -88,3 +88,13 @@ export async function buildTextToRadio(
   });
   return { bytes: frame(toBinary(P.Mesh.ToRadioSchema, toRadio)), id };
 }
+
+export async function buildWantConfigToRadio(
+  wantConfigId: number,
+): Promise<Uint8Array> {
+  const P = await loadProto();
+  const toRadio = create(P.Mesh.ToRadioSchema, {
+    payloadVariant: { case: 'wantConfigId', value: wantConfigId },
+  });
+  return toBinary(P.Mesh.ToRadioSchema, toRadio);
+}