added I-Am reception to the linux port.

bacnet-stack/iam.c

@@ -72,7 +72,7 @@ int iam_encode_apdu(
   return apdu_len;
 }
 
-int iam_decode_apdu(
+int iam_decode_service_request(
   uint8_t *apdu, 
   uint32_t *pDevice_id,
   unsigned *pMax_apdu,
@@ -88,16 +88,7 @@ int iam_decode_apdu(
   unsigned int decoded_value = 0;
   int decoded_integer = 0;
 
-  // valid data?
-  if (!apdu)
-    return -1;
-  // optional checking - most likely was already done prior to this call
-  if (apdu[0] != PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST)
-    return -1;
-  if (apdu[1] != SERVICE_UNCONFIRMED_I_AM)
-    return -1;
   // OBJECT ID - object id
-  apdu_len = 2;
   len = decode_tag_number_and_value(&apdu[apdu_len], &tag_number, &len_value);
   apdu_len += len;
   if (tag_number != BACNET_APPLICATION_TAG_OBJECT_ID)
@@ -143,6 +134,33 @@ int iam_decode_apdu(
   return apdu_len;
 }
 
+int iam_decode_apdu(
+  uint8_t *apdu, 
+  uint32_t *pDevice_id,
+  unsigned *pMax_apdu,
+  int *pSegmentation,
+  uint16_t *pVendor_id)
+{
+  int apdu_len = 0; // total length of the apdu, return value
+
+  // valid data?
+  if (!apdu)
+    return -1;
+  // optional checking - most likely was already done prior to this call
+  if (apdu[0] != PDU_TYPE_UNCONFIRMED_SERVICE_REQUEST)
+    return -1;
+  if (apdu[1] != SERVICE_UNCONFIRMED_I_AM)
+    return -1;
+  apdu_len = iam_decode_service_request(
+    &apdu[2], 
+    pDevice_id,
+    pMax_apdu,
+    pSegmentation,
+    pVendor_id);
+  
+  return apdu_len;
+}
+
 #ifdef TEST
 #include <assert.h>
 #include <string.h>

bacnet-stack/iam.h

@@ -44,6 +44,13 @@ int iam_encode_apdu(
   int segmentation,
   uint16_t vendor_id);
 
+int iam_decode_service_request(
+  uint8_t *apdu, 
+  uint32_t *pDevice_id,
+  unsigned *pMax_apdu,
+  int *pSegmentation,
+  uint16_t *pVendor_id);
+  
 int iam_decode_apdu(
   uint8_t *apdu, 
   uint32_t *pDevice_id,

bacnet-stack/ports/linux/main.c

@@ -120,6 +120,29 @@ void WhoIsHandler(
   return;  
 }
 
+void IAmHandler(
+  uint8_t *service_request,
+  uint16_t service_len,
+  BACNET_ADDRESS *src)
+{
+  int len = 0;
+  uint32_t device_id = 0;
+  unsigned max_apdu = 0;
+  int segmentation = 0;
+  uint16_t vendor_id = 0;
+
+  len = iam_decode_service_request(
+    service_request,
+    &device_id,
+    &max_apdu,
+    &segmentation,
+    &vendor_id);
+  if (len != -1)
+    fprintf(stderr,"Received I-Am Request from %u!\n",device_id);
+
+  return;  
+}
+
 void ReadPropertyHandler(
   uint8_t *service_request,
   uint16_t service_len,
@@ -261,6 +284,9 @@ static void Init_Service_Handlers(void)
   apdu_set_unconfirmed_handler(
     SERVICE_UNCONFIRMED_WHO_IS,
     WhoIsHandler);
+  apdu_set_unconfirmed_handler(
+    SERVICE_UNCONFIRMED_I_AM,
+    IAmHandler);
 
   // set the handler for all the services we don't implement
   // It is required to send the proper reject message...