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you should use:
libs=rddleto_20190517

i already use libs=rddleto_20190517 in my project
please see the image error on the left

you wrote:
libs=librddleto_20190517

you should use:
libs=rddleto_20190517

from your link the are only librddleto_20190517.a file , i will rename to rddleto_20190517.a and i try
hope every thing going well .

many tanks

same error ,

You don't have to rename file!
All lib filenames compiled with MinGW start with prefix LIB
But, in configurations tab, you don't use this prefix, simply writing:
libs=rddleto_20190517

Thank you Marek...
One question: in " cLetoSerwer " i can use IP and/or PcHost-Name ?
example: in same pc = localhost, in remote pc = Pc-Server or i need 127.0.0.1 and 192.168.1.xxx (pc server local ip)

cLetoSerwer can be IP or symbolic name

Thank you so much, Marek...

Sorry, I have no time to write everything, but I'll answer for all of your questions.
Of course, only if I will be able