dali/bacnet_stack
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Added some javadoc-type function comments.

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Reduced the default hop count from way-big 255 to 15.
This commit is contained in:
tbrennan3
2010-09-28 21:05:38 +00:00
parent 44b7e02721
commit e5f5dce995
3 changed files with 51 additions and 7 deletions
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bacnet-stack/src/npdu.c
+24 -2
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@@ -178,7 +178,7 @@ int npdu_encode_pdu(
/* destined for a remote network, i.e., if DNET is present. */
/* This is a one-octet field that is initialized to a value of 0xff. */
if (dest && dest->net) {
npdu[len] = npdu_data->hop_count;
npdu[len] = npdu_data->hop_count -1;
len++;
}
if (npdu_data->network_layer_message) {
@@ -243,6 +243,27 @@ void npdu_encode_npdu_data(
}
}
/** Decode the NPDU portion of a received message, particularly the NCPI byte.
* The Network Layer Protocol Control Information byte is described
* in section 6.2.2 of the BACnet standard.
* @param npdu [in] Buffer holding the received NPDU header bytes (must be at least 2)
* @param dest [out] Returned with routing destination information if the NPDU
* has any and if this points to non-null storage for it.
* If dest->net and dest->len are 0 on return, there is no
* routing destination information.
* @param src [out] Returned with routing source information if the NPDU
* has any and if this points to non-null storage for it.
* If src->net and src->len are 0 on return, there is no
* routing source information.
* This src describes the original source of the message when
* it had to be routed to reach this BACnet Device.
* @param npdu_data [out] Returns a filled-out structure with information
* decoded from the NCPI and other NPDU bytes.
* @return On success, returns the number of bytes which were decoded from the
* NPDU section; if this is a network layer message, there may be more
* bytes left in the NPDU; if not a network msg, the APDU follows.
* If 0 or negative, there were problems with the data or arguments.
*/
int npdu_decode(
uint8_t * npdu,
BACNET_ADDRESS * dest,
@@ -370,7 +391,8 @@ int npdu_decode(
if (npdu_data->network_message_type >= 0x80)
len += decode_unsigned16(&npdu[len], &npdu_data->vendor_id);
} else {
/* FIXME: another value for this? */
/* Since npdu_data->network_layer_message is false,
* it doesn't much matter what we set here; this is safe: */
npdu_data->network_message_type = NETWORK_MESSAGE_INVALID;
}
}