Issue when adding message with payment type

Developers
1

Hi Ardor developer:
We have experience issue when broadcasting payment type transaction on Ardor chain with message (it works without message)

Following is our transaction definition which follows the document
```

/// Documentation here: How Tx Processing Works

#[derive(Debug, Clone)]

pub struct ArdrTransaction {

pub chain: ArdrChain,

pub _type: ArdrTransactionType,

pub subtype: ArdrTransactionSubType,

pub tx_version: ArdrTransactionVersion,

pub timestamp: u32,

pub deadline: u16,

pub sender_public_key: [u8; 32],

pub recipient: u64,

pub amount_nqt: u64,

pub fee_nqt: u64,

pub signature: Signature,

pub ec_block_height: u32,

pub ec_block_id: u64,

pub appendages: ArdrAppendage,

}

pub struct ArdorAppendage {
flags: u32,
message: Option,
}

/// We will set flags to 1 if there are message)
```

The transfer can work correctly if no message attached, however when there are message, we got this error while broadcasting the transaction
nxt.NxtException$NotValidException: Appendix not allowed on Fxt chain

Could you help to explain a bit why we getting this error message, and how it is expected to send message along with transfer transaction?
Thanks!

2

UPDATE:

We’ve tried getting unsigned transaction bytes with prunable messages, however we are still getting the error nxt.NxtException$NotValidException: Appendix not allowed on Fxt chain,

May I confirm that does this prunable message works on parent chain? Or it only works on child chain like Ignis?
Thanks!

3

Hi, the PrunablePlainMessageAppendix and the PrunableEncryptedMessageAppendix are allowed on ARDR chain. They are with types 0x08 and 0x10 respectively. Type 0x01 is the non-prunable message which is not allowed and as a result you get that error.

Here are example bytes of a valid transaction with PrunablePlainMessageAppendix. I added new lines for clarity:

01000000
fe
00
01
5313250f
0f00
0507916d19b81d9f714c4f9eaf7ad4742b013c106c34cb9d2fb663d5e101df75
51006816b7a4961e
00e1f50500000000
00e1f50500000000
80276b1b28b4c51114026a3d5b9dc6b88d1c84400b436627668df9542386b902
96237dc9693f43bafaf8f527a323fec7c5814b3dff788dfe1b6e9d633574d3fc
b0e20701
636027880096487c
08000000 //flags
01 //version
00 //flags
938725ef2c126a889e25313269edf12e6efa48d6d11c1bdb3b78110146004858
4

Thanks a lot! Let me try to change the message type