Complex RialtoParachain <> Millau relay (#1405)

* complex parachain relay

* fix spelling

bridges/relays/bin-substrate/src/chains/millau.rs

@@ -43,6 +43,15 @@ impl CliEncodeMessage for Millau {
 				},
 			)
 			.into(),
+			bridge::MILLAU_TO_RIALTO_PARACHAIN_INDEX =>
+				millau_runtime::Call::BridgeRialtoParachainMessages(
+					millau_runtime::MessagesCall::send_message {
+						lane_id: lane,
+						payload,
+						delivery_and_dispatch_fee: fee,
+					},
+				)
+				.into(),
 			_ => anyhow::bail!(
 				"Unsupported target bridge pallet with instance index: {}",
 				bridge_instance_index

bridges/relays/bin-substrate/src/chains/rialto_parachains_to_millau.rs

@@ -19,7 +19,10 @@
 use parachains_relay::ParachainsPipeline;
 use relay_millau_client::Millau;
 use relay_rialto_client::Rialto;
-use substrate_relay_helper::parachains_target::DirectSubmitParachainHeadsCallBuilder;
+use relay_rialto_parachain_client::RialtoParachain;
+use substrate_relay_helper::parachains::{
+	DirectSubmitParachainHeadsCallBuilder, SubstrateParachainsPipeline,
+};
 
 /// Rialto-to-Millau parachains sync description.
 #[derive(Clone, Debug)]
@@ -30,6 +33,17 @@ impl ParachainsPipeline for RialtoParachainsToMillau {
 	type TargetChain = Millau;
 }
 
+impl SubstrateParachainsPipeline for RialtoParachainsToMillau {
+	type SourceParachain = RialtoParachain;
+	type SourceRelayChain = Rialto;
+	type TargetChain = Millau;
+
+	type SubmitParachainHeadsCallBuilder = RialtoParachainsToMillauSubmitParachainHeadsCallBuilder;
+	type TransactionSignScheme = Millau;
+
+	const SOURCE_PARACHAIN_PARA_ID: u32 = bp_rialto_parachain::RIALTO_PARACHAIN_ID;
+}
+
 /// `submit_parachain_heads` call builder for Rialto-to-Millau parachains sync pipeline.
 pub type RialtoParachainsToMillauSubmitParachainHeadsCallBuilder =
 	DirectSubmitParachainHeadsCallBuilder<