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BlueNRG: No HCI ACL Data

Question asked by robitzki.torsten on May 13, 2015
Latest reply on Jul 21, 2015 by pitrulli.salvatore
Hello,
now I have my STM32 up and running, communicating with a BlueNRG. But after the first connection event, I do not get any ACL data. With my BLE sniffer, I see an ATT "exchange MTU request", but I don't get any incoming ACL data. 

I've read the documentation to both, HCI_Set_Event_Mask and HCI_LE_Set_Event_Mask, there seems to be no means to switch on ACL data.

I've issued a HCI_LE_Read_Buffer_Size command and got the response, that the HCI stack accepts one ACL data packets with a maximum length of 0x1b (that's the minimum ATT MTU + L2CAP overhead). So it looks like the HCI stack knows about ACL data packets and UM1755 states in 2.1. that HCI ACL data packet are supported.

I receive also the disconnect event from the GATT client after it tried to issue some ATT requests and timed out.

What could be the issue here? Any help, pointer or comments are highly appreciated.

kind regards,
Torsten

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