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updated can_send_now in docu

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Milanka Ringwald 2015-07-03 14:20:44 +02:00
parent 6f692ea796
commit 15d0eaf5d9
1 changed files with 8 additions and 16 deletions
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24
docs/manual/docs/protocols.md
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@ -463,10 +463,7 @@ assumption, the single output buffer design does not impose additional
restrictions. In the following, we show how this is used for adapting
the RFCOMM send rate.
BTstack returns BTSTACK_ACL_BUFFERS_FULL, if the outgoing buffer is
full and RFCOMM_NO_OUTGOING_CREDITS, if no outgoing credits are
available. In Listing [below](#lst:SingleOutputBufferTryToSend), we show how to
resend data packets when credits or outgoing buffers become available.
Before sending data packets, check if RFCOMM can send them by calling rfcomm_can_send_packet_now, as shown in Listing [below](#lst:SingleOutputBufferTryToSend). L2CAP, BNEP, and ATT API offer similar functions.
~~~~ {#lst:SingleOutputBufferTryToSend .c caption="{Preparing and sending data.}"}
void prepareData(void){
@ -476,20 +473,15 @@ resend data packets when credits or outgoing buffers become available.
void tryToSend(void){
if (!dataLen) return;
if (!rfcomm_channel_id) return;
if (!rfcomm_can_send_packet_now(rfcomm_channel_id)) return;
int err = rfcomm_send_internal(rfcomm_channel_id, dataBuffer, dataLen);
switch (err){
case 0:
// packet is sent prepare next one
prepareData();
break;
case RFCOMM_NO_OUTGOING_CREDITS:
case BTSTACK_ACL_BUFFERS_FULL:
break;
default:
printf("rfcomm_send_internal() -> err %d\n\r", err);
break;
if (err) {
log_error("rfcomm_send_internal -> error 0X%02x", err);
return;
}
// packet is sent prepare next one
prepareData();
}
~~~~