Dear Edgar,
Hope I typed your name correctly. Thanks for your feedback. Please refer below comment from me.
I am not going to upload app on play store but in future I may. Yet, for my curiosity, I would like to comment on both, YES and NO.
YES: B4A does not generate any error logs. So, I believe error is not thrown by APP and No error is occuring.
No: Do you suggest to continue with SDK version 26 in Manifest Editor? No need to change to 29?
[One more observation I would like to state here. While APP connects to ESP8266 SSID, I can see on my mobile that WiFi is Off and again ON (toggle movement) however when SDH version is set to 29, nothing happens.]