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connoisseur_de_mimi
Associate III
December 10, 2025
Question

STM32CubeMonitor-RF 2.19.0 not sending ACI_GATT_CONFIRM_INDICATION after receiving indication

  • December 10, 2025
  • 5 replies
  • 571 views

I have a characteristic that supports write and indicate. A command is written to the char, the server responds by indicating the characteristic to the client. 

I'm using Stm32CubeMonitor-RF 2.19.0 to test the server, but indications always cause a ACI_GATT_PROC_TIMEOUT_EVENT because STM32CubeMonitor-RF does not issue a ACI_GATT_CONFIRM_INDICATION after an indication is received. 

log file attached. 

    5 replies

    Richard.Chvr
    Technical Moderator
    December 10, 2025

    Thank you for reporting, unfortunately, your log could not be read for the moment see this post.

    To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
    connoisseur_de_mimi
    Associate III
    December 10, 2025

    log file: 

    Nb,Time,Port Com,Type,Parameter,Value,Literal,Information
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,hci_packet_indicator,0x01,HCI Command Packet,
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,op_code,0xFD1C,ACI_GATT_WRITE_CHAR_VALUE,
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,parameter_total_length,0x06,,
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,connection_handle,0x0801,,Specifies the ATT bearer for which the command applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,attr_handle,0x0019,,Handle of the characteristic value to be written
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,attribute_val_length,0x01,,Length of the value to be written
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,attribute_val,0x02,,Value to be written
    1328,13:56:41:283,COM6,ACI_GATT_WRITE_CHAR_VALUE,Raw,[0x01:0x1C:0xFD:0x06:0x01:0x08:0x19:0x00:0x01:0x02],,
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,event_code,0x0F,HCI_COMMAND_STATUS_EVENT,
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,parameter_total_length,0x04,,
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,status,0x00,Success,Status error code.
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,num_hci_command_packets,0x01,,The Number of HCI command packets which are allowed to be sent to the Controller from the Host.
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,command_opcode,0xFD1C,ACI_GATT_WRITE_CHAR_VALUE,Opcode of the command which caused this event.
    1329,13:56:41:284,COM6,HCI_COMMAND_STATUS_EVENT,Raw,[0x04:0x0F:0x04:0x00:0x01:0x1C:0xFD],,
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,event_code,0xFF,HCI_VENDOR_EVENT,
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,parameter_total_length,0x05,,
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,ecode,0x0C10,ACI_GATT_PROC_COMPLETE_EVENT,
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,connection_handle,0x0801,,Specifies the ATT bearer for which the event applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,error_code,0x00,,"Indicates whether the procedure completed with an error or was successful (see ""Status error codes"" section)"
    1330,13:56:41:435,COM6,HCI_VENDOR_EVENT,Raw,[0x04:0xFF:0x05:0x10:0x0C:0x01:0x08:0x00],,
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,hci_packet_indicator,0x01,HCI Command Packet,
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,op_code,0xFD1C,ACI_GATT_WRITE_CHAR_VALUE,
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,parameter_total_length,0x07,,
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,connection_handle,0x0801,,Specifies the ATT bearer for which the command applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,attr_handle,0x0018,,Handle of the characteristic value to be written
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,attribute_val_length,0x02,,Length of the value to be written
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,attribute_val,0x0104,,Value to be written
    1331,13:56:46:032,COM6,ACI_GATT_WRITE_CHAR_VALUE,Raw,[0x01:0x1C:0xFD:0x07:0x01:0x08:0x18:0x00:0x02:0x04:0x01],,
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,event_code,0x0F,HCI_COMMAND_STATUS_EVENT,
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,parameter_total_length,0x04,,
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,status,0x00,Success,Status error code.
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,num_hci_command_packets,0x01,,The Number of HCI command packets which are allowed to be sent to the Controller from the Host.
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,command_opcode,0xFD1C,ACI_GATT_WRITE_CHAR_VALUE,Opcode of the command which caused this event.
    1332,13:56:46:033,COM6,HCI_COMMAND_STATUS_EVENT,Raw,[0x04:0x0F:0x04:0x00:0x01:0x1C:0xFD],,
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,event_code,0xFF,HCI_VENDOR_EVENT,
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,parameter_total_length,0x05,,
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,ecode,0x0C10,ACI_GATT_PROC_COMPLETE_EVENT,
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,connection_handle,0x0801,,Specifies the ATT bearer for which the event applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,error_code,0x00,,"Indicates whether the procedure completed with an error or was successful (see ""Status error codes"" section)"
    1333,13:56:46:155,COM6,HCI_VENDOR_EVENT,Raw,[0x04:0xFF:0x05:0x10:0x0C:0x01:0x08:0x00],,
    1334,13:56:46:156,,HCI_VENDOR_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1334,13:56:46:156,,HCI_VENDOR_EVENT,event_code,0xFF,HCI_VENDOR_EVENT,
    1334,13:56:46:156,,HCI_VENDOR_EVENT,parameter_total_length,0x1B,,
    1334,13:56:46:156,,HCI_VENDOR_EVENT,ecode,0x0C0E,ACI_GATT_INDICATION_EVENT,
    1334,13:56:46:156,,HCI_VENDOR_EVENT,connection_handle,0x0801,,Specifies the ATT bearer for which the event applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1334,13:56:46:156,,HCI_VENDOR_EVENT,attribute_handle,0x0018,,The handle of the attribute
    1334,13:56:46:156,,HCI_VENDOR_EVENT,attribute_value_length,0x14,,Length of Attribute_Value in octets
    1334,13:56:46:156,,HCI_VENDOR_EVENT,attribute_value,0x0000000000000000000000000000000000000304,,The current value of the attribute
    1334,13:56:46:156,,HCI_VENDOR_EVENT,Raw,[0x04:0xFF:0x1B:0x0E:0x0C:0x01:0x08:0x18:0x00:0x14:0x04:0x03:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00:0x00],,
    1335,13:57:16:156,,HCI_VENDOR_EVENT,hci_packet_indicator,0x04,HCI Event packet,
    1335,13:57:16:156,,HCI_VENDOR_EVENT,event_code,0xFF,HCI_VENDOR_EVENT,
    1335,13:57:16:156,,HCI_VENDOR_EVENT,parameter_total_length,0x04,,
    1335,13:57:16:156,,HCI_VENDOR_EVENT,ecode,0x0C02,ACI_GATT_PROC_TIMEOUT_EVENT,
    1335,13:57:16:156,,HCI_VENDOR_EVENT,connection_handle,0x0801,,Specifies the ATT bearer for which the event applies.. Possible values:. 0x0000 ... 0x0EFF: Unenhanced ATT bearer (the parameter is the connection handle). 0xEA00 ... 0xEA3F: Enhanced ATT bearer (the LSB-byte of the parameter is the connection-oriented channel index)
    1335,13:57:16:156,,HCI_VENDOR_EVENT,Raw,[0x04:0xFF:0x04:0x02:0x0C:0x01:0x08],,
    Richard.Chvr
    Technical Moderator
    December 11, 2025

    Thank you for the log. 

    Sound like being a bug in CubeMonitor-RF, because ACI_GATT_PROC_COMPLETE_EVENT happens, the tool considers the command is finished and does not wait for any further event and ignores the ACI_GATT_INDICATION_EVENT. 

    Issue have been reported to dev team.

    To give better visibility on the answered topics, please click on Accept as Solution on the reply which solved your issue or answered your question.
    connoisseur_de_mimi
    Associate III
    December 11, 2025

    thank you!

    connoisseur_de_mimi
    Associate III
    January 23, 2026

    When can we expect a fixed version to be released?