Reusable free code: Simple components - MODBUS.Synchronos.connect not returning

Reusable free code: Simple components - MODBUS.Synchronos.connect not returning

[Karl Müller]

Hello,

it's my first contribution to this sophisticated newsgroup and I hope 
I'm not disturbing too much.

Trying the Modbus test programs of the Simple components from Dmitry 
Kazakov I made the experience that the MODBUS.Synchronos client is not 
returning after calling the connect procedure. When I set the Timeout 
value to 5 seconds the Tracer is writing and after that time the program 
exits:

127.0.0.1:1502 < --- Stop polling, nothing to send
127.0.0.1:1502 < +++ Resume polling, blocking timeout expired
127.0.0.1:1502 < --- Stop polling, nothing to send
Worker task exiting
raised 
GNAT.SOCKETS.CONNECTION_STATE_MACHINE.MODBUS_CLIENT.SYNCHRONOUS.TIMEOUT_ERROR 
: Connection timeout expired

To my suprise the MODBUS test program with multiple connections is 
working as expected.

Is there anything I'm not aware off when using the MODBUS_CLIENT.SYNCHRONOS?

Regards

Karl

Re: Reusable free code: Simple components - MODBUS.Synchronos.connect not returning

[Dmitry A. Kazakov]

On 2018-08-28 10:04, Karl Müller wrote:
> Hello,
> 
> it's my first contribution to this sophisticated newsgroup and I hope 
> I'm not disturbing too much.
> 
> Trying the Modbus test programs of the Simple components from Dmitry 
> Kazakov I made the experience that the MODBUS.Synchronos client is not 
> returning after calling the connect procedure. When I set the Timeout 
> value to 5 seconds the Tracer is writing and after that time the program 
> exits:
> 
> 127.0.0.1:1502 < --- Stop polling, nothing to send
> 127.0.0.1:1502 < +++ Resume polling, blocking timeout expired
> 127.0.0.1:1502 < --- Stop polling, nothing to send
> Worker task exiting
> raised 
> GNAT.SOCKETS.CONNECTION_STATE_MACHINE.MODBUS_CLIENT.SYNCHRONOUS.TIMEOUT_ERROR 
> : Connection timeout expired
> 
> To my suprise the MODBUS test program with multiple connections is 
> working as expected.
> 
> Is there anything I'm not aware off when using the 
> MODBUS_CLIENT.SYNCHRONOS?

A synchronous client blocks on Connect until the server accepts 
connection or else the timeout expires. Or do you mean something else?

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de

Re: Reusable free code: Simple components - MODBUS.Synchronos.connect not returning

[Karl Müller]

On 28.08.2018 18:03, Dmitry A. Kazakov wrote:
> 
> A synchronous client blocks on Connect until the server accepts 
> connection or else the timeout expires. Or do you mean something else?
> 

Hello Dmitry,
thanks for the quick answer and for the enormous amount of work in your 
software giving away for free.

It looks like I have a miss understanding between client and server 
particularly on the MODBUS protocol. I will continue testing and using 
the MODBUS-Client with the new understanding.
Best regards
Karl

Re: Reusable free code: Simple components - MODBUS.Synchronos.connect not returning

[Dmitry A. Kazakov]

On 2018-08-28 20:03, Karl Müller wrote:
> On 28.08.2018 18:03, Dmitry A. Kazakov wrote:
>>
>> A synchronous client blocks on Connect until the server accepts 
>> connection or else the timeout expires. Or do you mean something else?
>>
> 
> Hello Dmitry,
> thanks for the quick answer and for the enormous amount of work in your 
> software giving away for free.
> 
> It looks like I have a miss understanding between client and server 
> particularly on the MODBUS protocol. I will continue testing and using 
> the MODBUS-Client with the new understanding.

Let me know if you discover problems or have questions.

-- 
Regards,
Dmitry A. Kazakov
http://www.dmitry-kazakov.de