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Fix MSTP slave FSM for Data-Expecting-Reply frames (#538)

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* Fix MSTP subordinate nodes Data-Expecting-Reply handling

---------

Co-authored-by: Steve Karg <skarg@users.sourceforge.net>
This commit is contained in:
Steve Karg
2023-11-20 19:08:28 -06:00
committed by GitHub
parent 1a55bd7b08
commit e1efca9d9e
5 changed files with 152 additions and 144 deletions
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ports/stm32f10x/dlmstp.c
+50 -45
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@@ -733,68 +733,70 @@ static void MSTP_Receive_Frame_FSM(void)
static void MSTP_Slave_Node_FSM(void)
{
/* destination address */
uint8_t destination;
/* source address */
uint8_t source;
/* any data to be sent - may be null */
uint8_t *data;
/* amount of data to be sent - may be 0 */
uint16_t data_len;
/* packet from the PDU Queue */
struct dlmstp_packet *pkt;
if (MSTP_Flag.ReceivedInvalidFrame) {
Master_State = MSTP_MASTER_STATE_IDLE;
if (MSTP_Flag.ReceivedInvalidFrame == true) {
/* ReceivedInvalidFrame */
/* invalid frame was received */
MSTP_Flag.ReceivedInvalidFrame = false;
} else if (MSTP_Flag.ReceivedValidFrame) {
MSTP_Flag.ReceivedValidFrame = false;
switch (FrameType) {
case FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY:
if (DestinationAddress != MSTP_BROADCAST_ADDRESS) {
/* The ANSWER_DATA_REQUEST state is entered when a */
/* BACnet Data Expecting Reply, a Test_Request, or */
/* a proprietary frame that expects a reply is received. */
pkt = (struct dlmstp_packet *)Ringbuf_Peek(&PDU_Queue);
if (pkt != NULL) {
MSTP_Send_Frame(pkt->frame_type, pkt->address.mac[0],
This_Station, (uint8_t *)&pkt->pdu[0],
pkt->pdu_len);
Master_State = MSTP_MASTER_STATE_IDLE;
/* clear our flag we were holding for comparison */
MSTP_Flag.ReceivedValidFrame = false;
/* clear the queue */
(void)Ringbuf_Pop(&PDU_Queue, NULL);
} else if (rs485_silence_elapsed(Treply_delay)) {
/* If no reply will be available from the higher layers
within Treply_delay after the reception of the final
octet of the requesting frame (the mechanism used
to determine this is a local matter), then no reply
is possible. */
MSTP_Flag.ReceivedValidFrame = false;
}
} else {
/* no reply when addressed as Broadcast */
MSTP_Flag.ReceivedValidFrame = false;
/* indicate successful reception to the higher layers */
MSTP_Flag.ReceivePacketPending = true;
}
break;
case FRAME_TYPE_TEST_REQUEST:
MSTP_Flag.ReceivedValidFrame = false;
destination = SourceAddress;
source = This_Station;
data = &InputBuffer[0];
data_len = DataLength;
MSTP_Send_Frame(FRAME_TYPE_TEST_RESPONSE, destination, source,
data, data_len);
MSTP_Send_Frame(FRAME_TYPE_TEST_RESPONSE, SourceAddress,
This_Station, &InputBuffer[0], DataLength);
break;
case FRAME_TYPE_TOKEN:
case FRAME_TYPE_POLL_FOR_MASTER:
case FRAME_TYPE_TEST_RESPONSE:
case FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY:
default:
MSTP_Flag.ReceivedValidFrame = false;
break;
}
} else if (MSTP_Flag.ReceivePacketPending) {
if (!Ringbuf_Empty(&PDU_Queue)) {
/* packet from the PDU Queue */
struct mstp_pdu_packet *pkt;
/* did the frame in the queue match the last request? */
bool matched;
pkt = (struct mstp_pdu_packet *)Ringbuf_Peek(&PDU_Queue);
matched = dlmstp_compare_data_expecting_reply(&InputBuffer[0],
DataLength, SourceAddress, &pkt->buffer[0], pkt->length,
pkt->destination_mac);
if (matched) {
/* Reply */
/* If a reply is available from the higher layers */
/* within Treply_delay after the reception of the */
/* final octet of the requesting frame */
/* (the mechanism used to determine this is a local matter), */
/* then call MSTP_Send_Frame to transmit the reply frame */
/* and enter the IDLE state to wait for the next frame. */
uint8_t frame_type;
if (pkt->data_expecting_reply) {
frame_type = FRAME_TYPE_BACNET_DATA_EXPECTING_REPLY;
} else {
frame_type = FRAME_TYPE_BACNET_DATA_NOT_EXPECTING_REPLY;
}
MSTP_Send_Frame(frame_type, pkt->destination_mac, This_Station,
(uint8_t *)&pkt->buffer[0], pkt->length);
(void)Ringbuf_Pop(&PDU_Queue, NULL);
}
/* clear our flag we were holding for comparison */
MSTP_Flag.ReceivePacketPending = false;
} else if ((rs485_silence_elapsed(Treply_delay))) {
/* If no reply will be available from the higher layers
within Treply_delay after the reception of the final octet
of the requesting frame (the mechanism used to determine
this is a local matter), then no reply is possible. */
/* clear our flag we were holding for comparison */
MSTP_Flag.ReceivePacketPending = false;
}
}
}
@@ -1645,7 +1647,10 @@ uint16_t dlmstp_receive(BACNET_ADDRESS *src, /* source address */
if (This_Station != 255) {
/* if there is a packet that needs processed, do it now. */
if (MSTP_Flag.ReceivePacketPending) {
MSTP_Flag.ReceivePacketPending = false;
if (This_Station <= 127) {
/* master nodes clear immediately */
MSTP_Flag.ReceivePacketPending = false;
}
pdu_len = DataLength;
src->mac_len = 1;
src->mac[0] = SourceAddress;