[GitHub] [mynewt-nimble] HendrikVE opened a new issue #382: Callback triggered multiple times for same request

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HendrikVE opened a new issue #382: Callback triggered multiple times for same request
URL: https://github.com/apache/mynewt-nimble/issues/382
 
 
   Hello,
   
   I have an issue with nimble on RIOT. My testing environment is the following:
   - nrf52dk
   - latest RIOT master https://github.com/RIOT-OS/RIOT/commit/c0d907addc26450cae4de645711ecfac0fa85e1e (but problem is there for several weeks already)
   - RIOT example application 'nimble_gatt'
   - Nordics nrF Connect App (but also with my own one)
   
   If I read the read- and writeable characteristic, then its callback is called twice, the readonly characteristic only once. But if i write to the rw characteristic and read it again, the callback is called once from there on.
   In another application a callback is called 6 times on a read operation, which leads to empty messages if I don't handle every single callback, but that's problematic because it's a ringbuffer and I get the message exactly one time.
   
   @haukepetersen experienced the same issue on his board with the nimble_gatt example.
   
   Is that behaviour intended? I thought as a callback it should be only called once, when the characteristic is read from or wrote to, or am I wrong?
   
   Below is my terminal output:
   ```
   2019-03-23 17:23:19,013 - INFO # main(): This is RIOT! (Version: 2019.04-devel-597-gc0d90)
   2019-03-23 17:23:19,015 - INFO # NimBLE GATT Server Example
   
   2019-03-23 17:24:30,496 - INFO # service 'rw demo' callback triggered
   2019-03-23 17:24:30,499 - INFO # access to characteristic 'rw demo (write)'
   2019-03-23 17:24:30,501 - INFO # read from characteristic
   2019-03-23 17:24:30,508 - INFO # current value of rm_demo_write_data: 'This characteristic is read- and writeable!'
   2019-03-23 17:24:30,509 - INFO # 
   2019-03-23 17:24:30,642 - INFO # service 'rw demo' callback triggered
   2019-03-23 17:24:30,646 - INFO # access to characteristic 'rw demo (write)'
   2019-03-23 17:24:30,648 - INFO # read from characteristic
   2019-03-23 17:24:30,655 - INFO # current value of rm_demo_write_data: 'This characteristic is read- and writeable!'
   2019-03-23 17:24:30,655 - INFO # 
   
   2019-03-23 17:24:34,395 - INFO # service 'rw demo' callback triggered
   2019-03-23 17:24:34,399 - INFO # access to characteristic 'rw demo (read-only)'
   2019-03-23 17:24:34,401 - INFO # new random number: 8
   2019-03-23 17:24:34,402 - INFO # 
   
   2019-03-23 17:24:45,657 - INFO # service 'rw demo' callback triggered
   2019-03-23 17:24:45,660 - INFO # access to characteristic 'rw demo (write)'
   2019-03-23 17:24:45,662 - INFO # write to characteristic
   2019-03-23 17:24:45,669 - INFO # old value of rm_demo_write_data: 'This characteristic is read- and writeable!'
   2019-03-23 17:24:45,673 - INFO # new value of rm_demo_write_data: 'test'
   2019-03-23 17:24:45,674 - INFO # 
   
   2019-03-23 17:24:48,192 - INFO # service 'rw demo' callback triggered
   2019-03-23 17:24:48,195 - INFO # access to characteristic 'rw demo (write)'
   2019-03-23 17:24:48,198 - INFO # read from characteristic
   2019-03-23 17:24:48,201 - INFO # current value of rm_demo_write_data: 'test'
   2019-03-23 17:24:48,202 - INFO #
   ```

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