sample xcm message

gistfile1.ts

        const message = XcmVersionedXcm.V4([
            // 1. Withdraw DOT from Asset Hub
            XcmV4Instruction.WithdrawAsset([dotAsset]),

            // 2. Deposit to HydraDX with instructions
            XcmV4Instruction.DepositReserveAsset({
                assets: dotAssetFilter,
                dest: hydradxDest,
                xcm: [
                    // 2a. Pay for execution on HydraDX
                    XcmV4Instruction.BuyExecution({
                        fees: dotFeeAsset,
                        weight_limit: XcmV3WeightLimit.Unlimited()
                    }),
                    
                    // 2b. Exchange DOT for USDT
                    XcmV4Instruction.ExchangeAsset({
                        give: dotAssetSwapFilter,
                        want: [usdtAsset],
                        maximal: true
                    }),
                                    
                    // 2c. Send swapped assets (USDT) back to Asset Hub
                    XcmV4Instruction.InitiateReserveWithdraw({
                        assets: XcmV4AssetAssetFilter.Wild(
                            XcmV4AssetWildAsset.All()
                        ),
                        reserve: assetHubDest,
                        xcm: [
                            XcmV4Instruction.BuyExecution({
                                fees: dotFeeAsset,
                                weight_limit: XcmV3WeightLimit.Unlimited()
                            }),
                            XcmV4Instruction.DepositAsset({
                                assets: XcmV4AssetAssetFilter.Wild(
                                    XcmV4AssetWildAsset.All()
                                ),
                                beneficiary: beneficiary(bobKeyPair)
                            })
                        ]
                    }),
                ]
            })
        ]);