BLE notification and write value not working

RE: BLE notification and write value not working

MartinBL — Tue, 28 Nov 2017 08:34:17 GMT

@ Rahul: To answer your third question: In the tutorial, the write without response property for the characteristic is not set. That is probably why you get the "Write Without Response property "-warning. I'm not familiar with Swift, but maybe there is an API call looking something like this: CBCharacteristicWriteType.withResponse (Notice this is with response and not without). You can also try to set the read without response property on the peripheral side when you initiate the characteristic.

RE: BLE notification and write value not working

butch — Fri, 24 Nov 2017 13:34:49 GMT

Also, is the string representation of a UUID like "0xFF" instead of "FF"? Again, just random thought, not knowing where the Swift code came from.

RE: BLE notification and write value not working

butch — Fri, 24 Nov 2017 13:00:31 GMT

May I ask what app (what open source code repository) you might be using for Swift on iOS? (Because I am starting a similar project as yours.)

Random thoughts: Is "28\0" correct? If that is a C string type, it has a null terminator without you needing to specify one. I suppose the Swift String type wants you to specify a null terminator? Because you say it works on Android, but not in Swift iOS, is the bug on the central side?

RE: BLE notification and write value not working

MartinBL — Thu, 23 Nov 2017 17:14:42 GMT

In my case it seems to be the other way around. Have you enabled logging in sdk_config.h? Search for NRF_LOG_ENABLED and set it to 1. I think my plan was to change all printf statements to NRF_LOG_INFO().
That looks like a variable's address in RAM rather than the actual variable value. It seems to work fine when I try the code in your link with an Android phone. There seems to be a bug in the on_ble_write() function too. Try to use if((data_buffer & 0x0000FFFF) == .....) instead of if(data_buffer == .....) otherwise the statements will never be true.