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Added segmentation support for server reply. (#974)

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Added segmentation support for server devices for some services. Configure BACNET_SEGMENTATION_ENABLED=1 to include in the library, and adjust BACNET_MAX_SEGMENTS_ACCEPTED for maximum number of segments.
This commit is contained in:
Steve Karg
2025-11-15 13:33:36 -06:00
committed by GitHub
parent bea2ceba11
commit 3ea710f92f
25 changed files with 2112 additions and 144 deletions
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src/bacnet/bacdef.h
+16
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@@ -212,8 +212,24 @@ typedef struct BACnet_Object_Id {
uint32_t instance;
} BACNET_OBJECT_ID;
#if !defined(BACNET_MAX_SEGMENTS_ACCEPTED)
#if BACNET_SEGMENTATION_ENABLED
/* note: BACNET_MAX_SEGMENTS_ACCEPTED can be 1..255.
ASDU in this library is usually sized for 16-bit at 65535 max.
Therefore, the default here is limited to avoid overflow warnings. */
#define BACNET_MAX_SEGMENTS_ACCEPTED 32
#else
#define BACNET_MAX_SEGMENTS_ACCEPTED 1
#endif
#endif
#if !defined(MAX_APDU)
#define MAX_APDU 1476
#endif
#define MAX_NPDU (1 + 1 + 2 + 1 + MAX_MAC_LEN + 2 + 1 + MAX_MAC_LEN + 1 + 1 + 2)
#define MAX_PDU (MAX_APDU + MAX_NPDU)
/* Application Service Data Unit (ASDU) that has not yet been segmented
into a protocol data unit (PDU) by the lower layer. */
#define MAX_ASDU ((MAX_APDU * BACNET_MAX_SEGMENTS_ACCEPTED) + MAX_NPDU)
#define BACNET_ID_VALUE(bacnet_object_instance, bacnet_object_type) \
((((bacnet_object_type) & BACNET_MAX_OBJECT) << BACNET_INSTANCE_BITS) | \