Only the first 7 characteristics are exposed

[256dpi]

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The Adafruit Learn page states the following limits:

These values apply to firmware 0.7.0 and higher:
Maximum number of services: 10
Maximum number of characteristics: 30
Maximum buffer size for each characteristic: 32 bytes
Maximum number of CCCDs: 16

In my current project I'm registering one service with 9 characteristics, which should be ok. However, only the first 7 characteristics are expose via Bluetooth. The firmware properly assigns a index to the other characteristics and no commands fail, except that they are just not exposed.

Is this somekind of hidden limitation?

Do I need to split the characteristics up in multiple services?

[hathach]

Could you tell which board you are using and firmware version it is running. If possible please provide your sketch, it is much easier for us to reproduce the issue.

[256dpi]

Sorry for leaving out some context.

• Host: Arduino MKR1000
• Board: Bluefruit LE SPI Friend
• Firmware: 0.7.7
• Library: 1.9.4

I'm using the Adafruit_BLEGatt class to register the services and characteristics.

[256dpi]

I changed my code to use multiple services. Again all the commands are successful and when I run the atcommand sketch and issue AT+GATTLIST the following (complete) table is printed:

<- ID=01,UUID=0xBA1B,UUID128=63-2F-BA-1B-48-61-4E-4F-81-03-FF-EE-9D-50-33-B5
  ID=01,UUID=0xD327,UUID128=80-2D-D3-27-CA-04-4C-90-BE-86-A3-56-82-75-A5-10,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=02,UUID=0x3261,UUID128=B3-88-32-61-F3-60-4C-B7-97-91-C3-49-8F-B2-C1-51,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
ID=02,UUID=0x6804,UUID128=6B-0F-68-04-FB-9A-49-C3-B2-F2-85-44-9A-61-B8-11
  ID=03,UUID=0xFFF2,UUID128=19-3F-FF-F2-45-42-4E-BC-BE-1F-4A-35-5D-40-AC-57,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=04,UUID=0x764C,UUID128=CB-8A-76-4C-54-6C-47-87-9A-6F-42-73-82-D4-97-55,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=05,UUID=0xE543,UUID128=08-C4-E5-43-65-CC-4B-F6-BB-A8-C8-A5-BF-91-6C-3B,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=06,UUID=0xA59A,UUID128=AB-B4-A5-9A-85-E9-44-9C-80-F5-72-D8-06-A0-02-57,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=07,UUID=0xB1B1,UUID128=C5-EC-B1-B1-06-58-4F-C3-80-52-21-55-21-D4-19-25,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
ID=03,UUID=0x1959,UUID128=59-AB-19-59-F7-14-45-C1-A3-39-79-69-A4-B9-29-F6
  ID=08,UUID=0x7850,UUID128=25-42-78-50-28-F3-40-EA-92-6A-AB-3C-EB-6D-0B-56,PROPERTIES=0x0A,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
  ID=09,UUID=0x7CE0,UUID128=59-99-7C-E0-3A-50-43-3C-A2-00-D9-F6-D3-12-EB-7C,PROPERTIES=0x12,MIN_LEN=1,MAX_LEN=20,DATATYPE=1,DESCRIPTION=,PRESENTATION=19-00-00-27-00-00-00,VALUE=XXX
OK

However, all Bluetooth debug tools I used only show the first two services rather than all three, and the second service is missing the last characteristic. Might this be a firmware issue?

[hathach]

Can you use Adafruit Bluefruit App to see if it could detect all the service + characteristic. If you could upload your sketch, I am happy to run some tests for you here.

[256dpi]

I spent some more time debuggin this issue and still couldn't find the bug.

The Bluefruit App does not show the missing service and characteristics. I also tested the official "nRF Connect" app for iOS and "LightBlue" for OSX.

Here is the sketch I'm using to test the module. The sketch will perform a factory reset and add 3 services with 2, 5, and again 2 characteristics.

@hathach Thanks for looking into this.

[iharshadec]

Is this issue fixed in any updated release or still in TODO list?