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Added postpone reply because transmission of the segmented ComplexACK cannot begin until the node holds the token. (#1116)

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This commit is contained in:
Steve Karg
2025-11-15 13:08:27 -06:00
committed by GitHub
parent 51358e83f9
commit 9d1abbeba5
17 changed files with 539 additions and 1105 deletions
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ports/bsd/dlmstp_port.c
+2 -132
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@@ -447,136 +447,6 @@ void MSTP_Send_Frame(
RS485_Send_Frame(mstp_port, buffer, nbytes);
}
static bool dlmstp_compare_data_expecting_reply(
const uint8_t *request_pdu,
uint16_t request_pdu_len,
uint8_t src_address,
const uint8_t *reply_pdu,
uint16_t reply_pdu_len,
uint8_t dest_address)
{
uint16_t offset;
/* One way to check the message is to compare NPDU
src, dest, along with the APDU type, invoke id.
Seems a bit overkill */
struct DER_compare_t {
BACNET_NPDU_DATA npdu_data;
BACNET_ADDRESS address;
uint8_t pdu_type;
uint8_t invoke_id;
uint8_t service_choice;
};
struct DER_compare_t request;
struct DER_compare_t reply;
/* unused parameters */
(void)request_pdu_len;
(void)reply_pdu_len;
/* decode the request data */
request.address.mac[0] = src_address;
request.address.mac_len = 1;
offset = bacnet_npdu_decode(
request_pdu, request_pdu_len, NULL, &request.address,
&request.npdu_data);
if (request.npdu_data.network_layer_message) {
debug_printf("DLMSTP: DER Compare failed: "
"Request is Network message.\n");
return false;
}
request.pdu_type = request_pdu[offset] & 0xF0;
if (request.pdu_type != PDU_TYPE_CONFIRMED_SERVICE_REQUEST) {
debug_printf("DLMSTP: DER Compare failed: "
"Not Confirmed Request.\n");
return false;
}
request.invoke_id = request_pdu[offset + 2];
/* segmented message? */
if (request_pdu[offset] & BIT(3)) {
request.service_choice = request_pdu[offset + 5];
} else {
request.service_choice = request_pdu[offset + 3];
}
/* decode the reply data */
reply.address.mac[0] = dest_address;
reply.address.mac_len = 1;
offset = bacnet_npdu_decode(
reply_pdu, reply_pdu_len, &reply.address, NULL, &reply.npdu_data);
if (reply.npdu_data.network_layer_message) {
debug_printf("DLMSTP: DER Compare failed: "
"Reply is Network message.\n");
return false;
}
/* reply could be a lot of things:
confirmed, simple ack, abort, reject, error */
reply.pdu_type = reply_pdu[offset] & 0xF0;
switch (reply.pdu_type) {
case PDU_TYPE_SIMPLE_ACK:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_COMPLEX_ACK:
reply.invoke_id = reply_pdu[offset + 1];
/* segmented message? */
if (reply_pdu[offset] & BIT(3)) {
reply.service_choice = reply_pdu[offset + 4];
} else {
reply.service_choice = reply_pdu[offset + 2];
}
break;
case PDU_TYPE_ERROR:
reply.invoke_id = reply_pdu[offset + 1];
reply.service_choice = reply_pdu[offset + 2];
break;
case PDU_TYPE_REJECT:
case PDU_TYPE_ABORT:
case PDU_TYPE_SEGMENT_ACK:
reply.invoke_id = reply_pdu[offset + 1];
break;
default:
return false;
}
/* these don't have service choice included */
if ((reply.pdu_type == PDU_TYPE_REJECT) ||
(reply.pdu_type == PDU_TYPE_ABORT) ||
(reply.pdu_type == PDU_TYPE_SEGMENT_ACK)) {
if (request.invoke_id != reply.invoke_id) {
debug_printf("DLMSTP: DER Compare failed: "
"Invoke ID mismatch.\n");
return false;
}
} else {
if (request.invoke_id != reply.invoke_id) {
debug_printf("DLMSTP: DER Compare failed: "
"Invoke ID mismatch.\n");
return false;
}
if (request.service_choice != reply.service_choice) {
debug_printf("DLMSTP: DER Compare failed: "
"Service choice mismatch.\n");
return false;
}
}
if (request.npdu_data.protocol_version !=
reply.npdu_data.protocol_version) {
debug_printf("DLMSTP: DER Compare failed: "
"NPDU Protocol Version mismatch.\n");
return false;
}
if (request.npdu_data.priority != reply.npdu_data.priority) {
debug_printf("DLMSTP: DER Compare failed: "
"NPDU Priority mismatch.\n");
return false;
}
if (!bacnet_address_same(&request.address, &reply.address)) {
debug_printf("DLMSTP: DER Compare failed: "
"BACnet Address mismatch.\n");
return false;
}
return true;
}
/* Get the reply to a DATA_EXPECTING_REPLY frame, or nothing */
uint16_t MSTP_Get_Reply(struct mstp_port_struct_t *mstp_port, unsigned timeout)
{ /* milliseconds to wait for a packet */
@@ -595,7 +465,7 @@ uint16_t MSTP_Get_Reply(struct mstp_port_struct_t *mstp_port, unsigned timeout)
}
pkt = (struct mstp_pdu_packet *)Ringbuf_Peek(&poSharedData->PDU_Queue);
/* is this the reply to the DER? */
matched = dlmstp_compare_data_expecting_reply(
matched = npdu_is_data_expecting_reply(
&mstp_port->InputBuffer[0], mstp_port->DataLength,
mstp_port->SourceAddress, (uint8_t *)&pkt->buffer[0], pkt->length,
pkt->destination_mac);
@@ -604,7 +474,7 @@ uint16_t MSTP_Get_Reply(struct mstp_port_struct_t *mstp_port, unsigned timeout)
while (!matched &&
(pkt = (struct mstp_pdu_packet *)Ringbuf_Peek_Next(
&poSharedData->PDU_Queue, (uint8_t *)pkt)) != NULL) {
matched = dlmstp_compare_data_expecting_reply(
matched = npdu_is_data_expecting_reply(
&mstp_port->InputBuffer[0], mstp_port->DataLength,
mstp_port->SourceAddress, (uint8_t *)&pkt->buffer[0],
pkt->length, pkt->destination_mac);