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send/receive string via GATT in BLE

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1

I have been successfully sending and receiving hexa values via GATT using "Heart rate service" and with characteristic "Heart Rate Measurement". Now I need to send TX/RX strings over GATT. Can anyone help me out by giving suggestion about:

1. Which service should I use to send string?


2. Which characteristic should I use?


3. If not possible by predefined services, what should I do?

I need to send some characters from server side. The data should be received by the client for every instance of time.

c bluetooth-lowenergy termios bluetooth-gatt

share|improve this question

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There is no standardized service and characteristic for a serial protocol. Just choose one that is not assigned to a specific purpose. Write to the characteristic to send data to the peripheral; subscribe to updates to receive data from the peripheral. It's the same as for the heart rate measurement - except you also write to the characteristic.
  
  – Codo
  Mar 25 at 7:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My doubt is to chose which one?. Because I didn't got clear data from internet. Which service and which characteristics is suitable for it ?
  
  – Loki
  Mar 25 at 7:19
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can easily define a custom one for your needs.
  
  – Emil
  Mar 25 at 10:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The rule is to use a 128-bit UUID (and not a 16 or 32 bit one). See cypress.com/forum/psoc-4-ble/… or stackoverflow.com/questions/10243769/….
  
  – Codo
  Mar 25 at 16:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  At least let us know what the device is you are using as server. You can also use an app like nRF Connect to find your device and explore all the services and their characteristics. Best options are the characteristics capable of read, write and notify.
  
  – GrooverFromHolland
  Mar 25 at 20:24
  

  
  
  
  

 | 
show 2 more comments

1

I have been successfully sending and receiving hexa values via GATT using "Heart rate service" and with characteristic "Heart Rate Measurement". Now I need to send TX/RX strings over GATT. Can anyone help me out by giving suggestion about:

1. Which service should I use to send string?


2. Which characteristic should I use?


3. If not possible by predefined services, what should I do?

I need to send some characters from server side. The data should be received by the client for every instance of time.

c bluetooth-lowenergy termios bluetooth-gatt

share|improve this question

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  There is no standardized service and characteristic for a serial protocol. Just choose one that is not assigned to a specific purpose. Write to the characteristic to send data to the peripheral; subscribe to updates to receive data from the peripheral. It's the same as for the heart rate measurement - except you also write to the characteristic.
  
  – Codo
  Mar 25 at 7:13
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  My doubt is to chose which one?. Because I didn't got clear data from internet. Which service and which characteristics is suitable for it ?
  
  – Loki
  Mar 25 at 7:19
  

  
  
  
  


• 
  
  
  

  
  1
  

  
  
  
  
  
  

  
  
  You can easily define a custom one for your needs.
  
  – Emil
  Mar 25 at 10:03
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  The rule is to use a 128-bit UUID (and not a 16 or 32 bit one). See cypress.com/forum/psoc-4-ble/… or stackoverflow.com/questions/10243769/….
  
  – Codo
  Mar 25 at 16:34
  

  
  
  
  


• 
  
  
  

  
  

  
  
  
  
  
  

  
  
  At least let us know what the device is you are using as server. You can also use an app like nRF Connect to find your device and explore all the services and their characteristics. Best options are the characteristics capable of read, write and notify.
  
  – GrooverFromHolland
  Mar 25 at 20:24
  

  
  
  
  

 | 
show 2 more comments

I have been successfully sending and receiving hexa values via GATT using "Heart rate service" and with characteristic "Heart Rate Measurement". Now I need to send TX/RX strings over GATT. Can anyone help me out by giving suggestion about:

1. Which service should I use to send string?


2. Which characteristic should I use?


3. If not possible by predefined services, what should I do?

I need to send some characters from server side. The data should be received by the client for every instance of time.

c bluetooth-lowenergy termios bluetooth-gatt

share|improve this question

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

share|improve this question

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

share|improve this question

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

edited Mar 25 at 7:38

karel

2,45492832

edited Mar 25 at 7:38

karel

2,45492832

asked Mar 25 at 5:50

LokiLoki

61

asked Mar 25 at 5:50

LokiLoki

61