@Override
  public String toString() {
    return new StringJoiner(", ", BftMessage.class.getSimpleName() + "[", "]")
        .add("payload=" + payload)
        .toString();
  }
Read payload.

@param <T> the type parameter of Payload
@param rlpInput the rlp input
@param decoder the decoder
@return the signed data
consensus/common/src/main/java/org/hyperledger/besu/consensus/common/bft/messagewrappers/BftMessage.java