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I have a problem with the boost::asio::serial_port class reading from a GPS device (USB-Serial). Connecting the device and reading from it works fine, but when I disconnect and reconnect the device, read_some doesn't read any bytes from the port.
As boost doesn't seam to detect that the serial port is gone ( is_open() returns true ), I periodically cancel(), close() and open( GPS_PORT ) the device when I don't get data, resetting the port options on the way. But this doesn't help either, the input buffer stays empty.
Am I missing something, or doing something wrong, or is this a bug in asio? Is there a standard way to detect that the port is gone?
vividos
3 Answers
It's hard to say what is the exact reason in your case, but practice shows that you often need to disable RTS sensitivity on your serial port.
RTS is a pin on real RS-232 interface that is on when a device on the other side is on.
serial_port::read_some invokes underlying Windows API function that looks on this signal.
As you don't have the real RS-323 device, you need to rely on the driver emulation of this signal which may be faulty (and unfortunately often is).
To disable it, invoke serial_port::set_option(DCB) with RTSControl set to RTS_CONTROL_DISABLE.
If close()'ing your handle doesn't help, it may be a problem with boost. Source code for close() looks like this:
, i. e. if CloseHandle() fails for some reason (or hangs), the internal handle value is not beign assigned to INVALID_HANDLE_VALUE and is_open() will always return true.
To work around this, check is_open() right after close()'ing, and if it returns true, destroy whole instance of boost::asio::serial_port and create it again.
QuassnoiNormally you should get an exception of type boost::system::system_error when read_some cannot ready anymore. Try using read instead, maybe it returns an error and doesn't just return. You could also try the async methods; in this case the handler should get an error object when the device was disconnected.
Alterantively you could get the handle to the port using the native() function and call ClearCommError() on that. It might return the error.
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Despite of the easy handling of asio boost::ip:tcp, I think handling boost serial_port requires special caution on Windows 7.
I got similar problem and got over it by resetting an instance of boost::asio::io_service, io_service_.reset().
I can read data asynchronously but it fails to do same thing from the second try.
In fact, it was no problem of read function itself, registering asynchronous read failed, which led immediate return from boost::asio::io_service::run() in second try.
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I am not sure this is the same problem as original poster had because I am using newer boost library of these days.
Anyway here is my solution:
Not the answer you're looking for? Browse other questions tagged c++boostserial-portboost-asio or ask your own question.
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