[DUG] Bluetooth LE connection Problems

[Ian Fear]

Hi Tony

Have mucked around with firemonkey mostly seems OK  once you get your head
round the slightly different syntax etc

 

With BTLE for Android not sure if it has been well implemented seems to be
missing a function RequestMTU which sets the data pack size for gatt Android

And as a result the default size of 23 is used (ios and win don't appear to
have this issue)

Had to do an ugly hack to set this to 75 my packet size

Also not sure of the Issue about disconnecting etc

 

Regards

Ian

 

 

From: delphi-bounces at listserver.123.net.nz
<delphi-bounces at listserver.123.net.nz> On Behalf Of Tony Blomfield
Sent: Thursday, 2 July 2020 10:31 PM
To: NZ Borland Developers Group - Delphi List <delphi at listserver.123.net.nz>
Subject: Re: [DUG] Bluetooth LE connection Problems

 

I know nothing but am keen to know more. At this point have not tried
compiling for Android for BTLE, but Id be keen to have someone to talk to.

 

What is your overall impression of using Delphi for Android?

 

From: delphi-bounces at listserver.123.net.nz
<mailto:delphi-bounces at listserver.123.net.nz>
[mailto:delphi-bounces at listserver.123.net.nz] On Behalf Of David O'Brien
Sent: Thursday, 2 July 2020 7:55 PM
To: NZ Borland Developers Group - Delphi List <delphi at listserver.123.net.nz
<mailto:delphi at listserver.123.net.nz> >
Subject: Re: [DUG] Bluetooth LE connection Problems

 

Sorry, Don't know anything about the equipment, sounds like you are
receiving data, perhaps you need to ping it occasionally to keep the
connection alive? My Boom 3 disconnects if it gets nothing incoming for a
while.

 

From: delphi-bounces at listserver.123.net.nz
<mailto:delphi-bounces at listserver.123.net.nz>
<delphi-bounces at listserver.123.net.nz
<mailto:delphi-bounces at listserver.123.net.nz> > On Behalf Of Ian Fear
Sent: Thursday, 2 July 2020 4:49 PM
To: delphi at listserver.123.net.nz <mailto:delphi at listserver.123.net.nz> 
Subject: [DUG] Bluetooth LE connection Problems

 

using Delphi 10.4 have a BLE Connection on Android tablet to Gatt server on
Industrial device

have two characteristics to subscribe to this works fine

but about every minute it disconnects at which point I Must reconnect

and resubscribe to the characteristics taking about 15 or so seconds

as my incoming data is every second this is quite unsatisfactory

Any Ideas on what I have done wrong or need to do to improve the situation
greatly appreciated

the issue appears to be in the Delphi App as nRF Connect does not
demonstrate this problem

any Ideas Help Greatly Appreciated

Regards

 

Ian Fear

 

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