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Mavlink get_free_tx_buf() minor cleanup #12969

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Mavlink get_free_tx_buf() minor cleanup #12969

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19 changes: 12 additions & 7 deletions src/modules/mavlink/mavlink_main.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -749,17 +749,22 @@ Mavlink::get_free_tx_buf()
*/
int buf_free = 0;

#if defined(CONFIG_NET) || defined(__PX4_POSIX)

// if we are using network sockets, return max length of one packet
if (get_protocol() == UDP || get_protocol() == TCP) {
return 1500;
return MAVLINK_MAX_PACKET_LEN;
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} else {
// No FIONSPACE on Linux todo:use SIOCOUTQ and queue size to emulate FIONSPACE
#if defined(__PX4_LINUX) || defined(__PX4_DARWIN) || defined(__PX4_CYGWIN)
//Linux cp210x does not support TIOCOUTQ
buf_free = 256;
#else
} else
#endif // CONFIG_NET || __PX4_POSIX
{

#if defined(__PX4_NUTTX)
(void) ioctl(_uart_fd, FIONSPACE, (unsigned long)&buf_free);
#else
// No FIONSPACE on Linux todo:use SIOCOUTQ and queue size to emulate FIONSPACE
// Linux cp210x does not support TIOCOUTQ
buf_free = MAVLINK_MAX_PACKET_LEN;
#endif

if (_flow_control_mode == FLOW_CONTROL_AUTO && buf_free < FLOW_CONTROL_DISABLE_THRESHOLD) {
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