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seriallink's Issues

packet parsing error issue when payload len is set as zero.

case PARSE_STATE_GOT_MSGID:
	if(ch > SERIAL_LINK_MAX_PAYLOAD_LEN) {
		status->parse_state = PARSE_STATE_IDLE;
		status->msg_status = LEN_ERROR;
	}
	else {
		packet->len = ch;
		status->parse_state = packet->len ? PARSE_STATE_GOT_LEN : PARSE_STATE_GOT_PAYLOAD;
		crc_accumulate(ch, &packet->chk);
		status->payload_index = 0;
	}
	break;

Payload might be zero because programmer might want to send just a command that no payload data.

There is a solution on above code.
If payload len is received as zero, parse_state should change as PARSE_STATE_GOT_PAYLOAD instead of PARSE_STATE_GOT_LEN.

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