mbm plugin gps improvements

[Tomas Jura]

On 29.1.2016 17:31, Aleksander Morgado wrote:
> On Fri, Jan 29, 2016 at 1:00 AM, Tomas Jura <tomas.jura1 at gmail.com> wrote:
>> The quick open/close action after the gps unmanaged end (patch #4 "flush
>> unmanaged GPS port after GPS is stopped") serves for draining the remaining
>> GPS sentences from the gps port. Without the drain some gps sentences can
>> remain in the input buffer and those debris are offered as an input during
>> the next gps read (for example after few hours). Reading such trash confuses
>> the reader of GPS sentences. The modes NMEA and RAW do the drain of the port
>> (during close). My patch just introduce the "drain and close" scenario to
>> the unmanaged mode.
> What about the AT*E2GPSCTL=0 command on disabling GPS? Does it not
> need to go to the GPS data port, as we did when enabling GPS? If that
> is the case, the open/close would be implicit as we need to send an AT
> command.
>
The AT*E2GPSCTL=0 goes into the control port, not to the gps data port. 
Patch drains the gps data port.

AFAIK the gps data port is not usable as a control port once switched to 
the gps data mode.
(source: http://www.natisbad.org/E4300/Dell_Wireless_5530_AT_cmd_ref.html)

T.