mulit: use min relay fee error

Author: ziggie1984

config_builder.go

@@ -1763,8 +1763,11 @@ func broadcastErrorMapper(err error) error {
 	// in the first place are rebroadcasted despite of their backend error.
 	// Mempool conditions change over time so it makes sense to retry
 	// publishing the transaction. Moreover we log the detailed error so the
-	// user can intervene and increase the size of his mempool.
-	case errors.Is(err, chain.ErrMempoolMinFeeNotMet):
+	// user can intervene and increase the size of his mempool or increase
+	// his min relay fee configuration.
+	case errors.Is(err, chain.ErrMempoolMinFeeNotMet),
+		errors.Is(err, chain.ErrMinRelayFeeNotMet):
+
 		ltndLog.Warnf("Error while broadcasting transaction: %v", err)
 
 		returnErr = &pushtx.BroadcastError{

lnwallet/btcwallet/btcwallet.go

@@ -1132,7 +1132,9 @@ func mapRpcclientError(err error) error {
 	// If the wallet reports that fee requirements for accepting the tx
 	// into mempool are not met, convert it to our internal ErrMempoolFee
 	// and return.
-	case errors.Is(err, chain.ErrMempoolMinFeeNotMet):
+	case errors.Is(err, chain.ErrMempoolMinFeeNotMet),
+		errors.Is(err, chain.ErrMinRelayFeeNotMet):
+
 		return fmt.Errorf("%w: %v", lnwallet.ErrMempoolFee, err.Error())
 	}