Timeout problem for 2400 baud

[btrhad]

I am using libmbus on a Beaglebone black and had no problems in retrieving data from various meter types. Until I encountered a GWF UniCocoder water meter. This meter is fixed at 2400 baud. I was able to do an address scan, but an serial-request-data at 2400 baud always failed. Checking with a scope I found the device was sending a correct response, but the Beaglebone as master was not able to parse the response.
I found out the Timeout for 2400 baud in mbus_serial_set_baudrate() was just a little bit to short.
Changing handle-t.c.c_cc[VTIME] from 2 to 3 solved the problem.

[lategoodbye]

@btrhad I want to know more about your setup (starting from Beaglebone until M-Bus wire).
What kind of M-Bus master do you use?
Do you use Linux on the Beaglebone?

Edit: Sorry, it's not your job but i don't access to a M-Bus setup, but could you please dump the return value of tcdrain by patching mbus-serial.c with your setup:

ret = tcdrain(handle->fd);
fprintf(stderr, "tcdrain = %d\n", ret);

[btrhad]

Hi Stefan, We use beaglebone black (rev C), with this cape: http://elinux.org/Apli_Hvac_cape (mbus/modbus) wich contains this mbus master interface: http://www.solvimus.de/smart-metering/m-bus-oem-master/ We use linux 4.4.30-ti-r64 kernel with debian 8 (Jessie) this is the beagleboard.org shipped default. And we add rscada/libmbus software. Please let me know if I need to provide more info Met vriendelijke groet, With kind regards, Betronic BV Henk Dijkstra Manager Connectivity Solutions ü Please<http://www.betronic.nl/jahia/Jahia/lang/en/pid/153> consider the environment before printing this e-mail From: Stefan Wahren [mailto:notifications@github.com] Sent: vrijdag 7 april 2017 16:05 To: rscada/libmbus Cc: Henk Dijkstra; Mention Subject: Re: [rscada/libmbus] Timeout problem for 2400 baud (#124) @btrhad<https://github.com/btrhad> I want to know more about your setup (starting from Beaglebone until M-Bus wire). What kind of M-Bus master do you use? Do you use Linux on the Beaglebone? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#124 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AZww2DilHB6I7F-TD-GWOujuzaRqUYusks5rtkKZgaJpZM4M26dD>.

[lategoodbye]

@btrhad Could you please try this branch (which contains your suggestion):

https://github.com/rscada/libmbus/tree/serial-timeout

[btrhad]

I can do that next week, don't have The module now at hand. I Will inform you of The result. Ps i also noted that The First req-ud2 starts with The fcb bit cleared, while all other mbus master sw starts with this bit set. Does this sound familiar? Verstuurd vanaf mijn iPhone Op 7 apr. 2017 om 18:08 heeft Stefan Wahren <notifications@github.com<mailto:notifications@github.com>> het volgende geschreven: @btrhad<https://github.com/btrhad> Could you please try this branch (which contains your suggestion): https://github.com/rscada/libmbus/tree/serial-timeout — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#124 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AZww2BMdobp99cTxkyIXDRlrwDU5vQzGks5rtl97gaJpZM4M26dD>.

[lategoodbye]

I created a branch to fix FCB handling:

https://github.com/rscada/libmbus/tree/fix-fcb-handling

but didn't get positive feedback. In case there is a real issue please feel free to open a new issue or at least try this branch, too.

[btrhad]

Hi Stefan, This branch works fine with all the mbus meters I have in my possession (at 9600 baud) including the 2400 baud GWF meter. Secondary address scan now also works reliable (which was not the case with libmbus release 0.8.0) I will monitor for the rest of the week, to check reliability. Met vriendelijke groet, With kind regards, Betronic BV Henk Dijkstra Manager Connectivity Solutions ü Please<http://www.betronic.nl/jahia/Jahia/lang/en/pid/153> consider the environment before printing this e-mail From: Stefan Wahren [mailto:notifications@github.com] Sent: vrijdag 7 april 2017 18:08 To: rscada/libmbus Cc: Henk Dijkstra; Mention Subject: Re: [rscada/libmbus] Timeout problem for 2400 baud (#124) @btrhad<https://github.com/btrhad> Could you please try this branch (which contains your suggestion): https://github.com/rscada/libmbus/tree/serial-timeout — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub<#124 (comment)>, or mute the thread<https://github.com/notifications/unsubscribe-auth/AZww2BMdobp99cTxkyIXDRlrwDU5vQzGks5rtl97gaJpZM4M26dD>.

[lategoodbye]

I merged the serial-timeout branch into the master.