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commenting out the section that checks for new packets to send. It was not the intent of the BACnet standard, but it makes the Master Node FSM compliant. It's either that or re-parse the message for a matching apdu and invoke id, and then defer if the next message does not match. The problem happens when an unconfirmed request (i.e. WhoIs) is followed immediated by a confirmed request (i.e. ReadProperty) before the device can respond to the unconfirmed request (i.e. the I-Am is queued in the Transmit buffer).
BACnet Stack - SourceForge.net Build for MPLAB IDE These are some settings that are important when building the BACnet Stack using MPLAB IDE and MCC18 Compiler, 1. Add the files to the project that you need: abort.c, apdu.c, bacapp.c, bacdcode.c, bacerror.c, bacstr.c, crc.c, datetime.c, dcc.c, iam.c, npdu.c, rd.c, reject.c, rp.c, whois.c, wp.c From ports/picxx: isr.c, main.c, rs485.c, mstp.c, dlmstp.c From demo/object/: device.c or dev_tiny.c objects as needed: ai.c, ao.c, etc. From demo/handler/: txbuf.c, h_dcc.c, h_rd.c, h_rp.c or h_rp_tiny.c Additional handlers as needed: h_wp.c 2. Project->Options->Project General Tab: Include Path: C:\code\bacnet-stack\;C:\code\bacnet-stack\demo\handler\;C:\code\bacnet-stack\demo\object\;C:\code\bacnet-stack\ports\pic18f6720\ MPLAB C18 Tab: Memory Model: Code: Large Code Model Data: Large Data Model Stack: Multi-bank Model MPLAB C18 Tab: General: Macro Definitions: PRINT_ENABLED=0 BACDL_MSTP=1 TSM_ENABLED=0 BIG_ENDIAN=0 3. The linker script must reserve some extra stack space. //DATABANK NAME=gpr12 START=0xC00 END=0xCFF //DATABANK NAME=gpr13 START=0xD00 END=0xDFF DATABANK NAME=stackreg START=0xC00 END=0xDFF PROTECTED //STACK SIZE=0x100 RAM=gpr13 STACK SIZE=0x200 RAM=stackreg