Thanks for the replies.
I tried also to the second case (for example, by pasted rbsoft) and the result is the same.
Server is configured as a TCP server. It's WiFi to RS232 module wiznet.
Wiznet module I have tested with other devices, as well as computer and communication works without problems and reliably.
I tried to phone the Samsung Galaxy XCOVER and Android tablet I-inn. On both running Android 4
Communication is established without problems the first few strings sent good, others are not. In the meantime, send any string as well. When interrupt communication on the side of Android, then arrive all previously transmitted string, which has not previously received. It is also in the opposite direction, the response from the wiznet module comes later and is also more strings together. Always get a double. So if you send a string from the server "TEST" in the android apps I stirng "TEST" is written as:
TEST
TEST
I suspect that something is happening with the buffer on the side of Android applications.
Thanks