What is the actual GATT operation you are using, notifications or indications? Indications are acknowledged, you can only send them on every second connection interval.

What is the other device that you are exchanging data with? Please provide clear instructions to replicate this.

This is something you can easily find in 5 seconds by just googling BGM113. All the essential technical information is here: https://www.silabs.com/products/wireless/bluetooth/bluetooth-low-energy/bgm113-bluetooth-low-energy-module

I have attached it here.

Can I partition PS key area into two areas such as

1. First 1024 bytes for user data

2. Second 1024 bytes for Bonding data

No

I don't understand your second part. What are you trying to accomplish exactly, or what problem are you having?

 

If you write the data from your smartphone app then you need to handle this from the mobile app side. The modules will just be slave devices to your smartphone (which will be the master). How you write the data is up to you but typically you will have a GATT server on the slave side and write data from the mobile app which acts as the GATT client. If your data is totally custom then you can create a simple custom GATT service for this purpose.

And I’ll like to ask if this app is able to provision more than 1 device at the same time into the same group?

Do you mean in parallel? No, you provision one device at a time. Adding them to the group is not part of provisioning, that is the configuration part.

Again, please provide clear information about your setup and clear steps on how to reproduce this problem.

Only you can answer this question, based on your application requirements. You are swapping a regular MCU with a wireless MCU so I'm assuming you want to add Bluetooth to your design. Then you need to think about pin count, peripherals that you need, energy consumption, cost... 

This question doesn't make any sense just thrown into the forum without any context or at least a clear list of requirements.

Are those devices that are not listed able to use the Bluetooth mesh app? 

No, but we only test with the listed ones.

There is no attachment.

About what part number exactly? Please refer to the datasheet for your specific part number.