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backend-native: Handle multi AT commands in a buffer

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When we connect Lenovo XT99 bt headset in the Ubuntu 22.04, this
headset could only work in A2DP profile, couldn't work in HFP profile
with a high chance.

This headset supports mSBC, after pulseaudio replies "+BCS:2" to
headset, we expect to receive a "AT+BCS=2\r" from the headset, but
with a high chance, it will receive 2 AT commands in a buffer like
this "AT+CHLD=?\rAT+BCS=2\r", and we also observed other 2 AT commands
in a buffer like this "AT+NREC=0\rAT+CGMI?\r".

Here we don't suppose there is only one AT command in a buffer, we
will find each command by the delimiter "\r" and handle each command
by sequence.

Signed-off-by: Hui Wang <hui.wang@canonical.com>
Part-of: <https://gitlab.freedesktop.org/pulseaudio/pulseaudio/-/merge_requests/804>
This commit is contained in:
Hui Wang 2023-12-25 19:42:07 +08:00
parent 81a6cc4967
commit d7dc04e8f5
1 changed files with 97 additions and 83 deletions
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22
src/modules/bluetooth/backend-native.c
View file

@ -889,21 +889,23 @@ static void rfcomm_io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_i
}
if (events & PA_IO_EVENT_INPUT) {
char buf[512];
char rbuf[512];
ssize_t len;
int gain, dummy;
bool do_reply = false;
int vendor, product, version, features;
char *buf = rbuf;
int num;
len = pa_read(fd, buf, 511, NULL);
len = pa_read(fd, rbuf, 511, NULL);
if (len < 0) {
pa_log_error("RFCOMM read error: %s", pa_cstrerror(errno));
goto fail;
}
buf[len] = 0;
pa_log_debug("RFCOMM << %s", buf);
rbuf[len] = 0;
pa_log_debug("RFCOMM << %s", rbuf);
while (buf[0]) {
/* There are only four HSP AT commands:
* AT+VGS=value: value between 0 and 15, sent by the HS to AG to set the speaker gain.
* +VGS=value is sent by AG to HS as a response to an AT+VGS command or when the gain
@ -989,6 +991,18 @@ static void rfcomm_io_callback(pa_mainloop_api *io, pa_io_event *e, int fd, pa_i
if (do_reply)
rfcomm_write_response(fd, "OK");
if (buf[0] == '\r') /* in case it is the command with format \r\nCOMMAND\r\n, skip the starting \r */
buf = buf + 1;
buf = strstr(buf, "\r"); /* try to find the next AT command in the buf */
if (!buf)
break;
else if (buf[1] == '\n')
buf = buf + 2; /* skip \r\n */
else
buf = buf + 1; /* skip \r */
}
}
return;