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[RFC] Wake HW serial device up before reading #18

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[RFC] Wake HW serial device up before reading #18

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4 changes: 4 additions & 0 deletions src/mavlink-router/endpoint.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -651,6 +651,10 @@ int UartEndpoint::read_msg(struct buffer *pbuf, int *target_sysid, int *target_c

ssize_t UartEndpoint::_read_msg(uint8_t *buf, size_t len)
{
// On some hardware-serial interfaces, it is necessary to kick the device
// before reading from it, otherwise we don't get any data
struct buffer dummy{0};
ssize_t p = ::write(fd, &dummy, 1);
ssize_t r = ::read(fd, buf, len);
if ((r == -1 && errno == EAGAIN) || r == 0)
return 0;
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