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CI · CI · commit 41404ffd5d38 · 2026-03-20T22:38:40.000Z
diff --git a/lib/bacnet/stack/transport/mstp_transport.ex b/lib/bacnet/stack/transport/mstp_transport.ex
@@ -2776,7 +2776,10 @@ if Code.ensure_loaded?(Circuits.UART) do
       data_payload =
         if data_len > 0 do
           # We need ones-complement of the DataCRC
-          data_crc = 0xFFFF - EncodingTools.calculate_data_crc(data, 0xFFFF)
+          # data_crc = 0xFFFF - EncodingTools.calculate_data_crc(data, 0xFFFF)
+
+          # Use Data CRC from frame
+          data_crc = state_data.data_crc_header
 
           [
             data,
diff --git a/lib/bacnet/stack/transport/mstp_transport/receive_fsm.ex b/lib/bacnet/stack/transport/mstp_transport/receive_fsm.ex
@@ -616,7 +616,7 @@ if Code.ensure_loaded?(Circuits.UART) do
       state_data = %{
         state_data
         | data_crc: EncodingTools.calculate_data_crc(crc, state_data.data_crc),
-          data_crc_header: Bitwise.bsl(state_data.data_crc_header, 8) + crc
+          data_crc_header: Bitwise.bsl(crc, 8) + state_data.data_crc_header
       }
 
       cond do

Original file line number	Diff line number	Diff line change
`@@ -616,7 +616,7 @@ if Code.ensure_loaded?(Circuits.UART) do`
`616`	`616`	`state_data = %{`
`617`	`617`	`state_data`
`618`	`618`	`\| data_crc: EncodingTools.calculate_data_crc(crc, state_data.data_crc),`
`619`		`- data_crc_header: Bitwise.bsl(state_data.data_crc_header, 8) + crc`
	`619`	`+ data_crc_header: Bitwise.bsl(crc, 8) + state_data.data_crc_header`
`620`	`620`	`}`
`621`	`621`
`622`	`622`	`cond do`