Discussion
Struggling to get my head round LE.
As a basic concept does it work by effectively having a load of registers which are called services, in the service is the data which is called the characteristic.
So in simplistic terms, to exchange data once the two ends are connected : One end puts some data ( a characteristic) in a service, the other end polls the service and reads the data. When data is ready it has to be placed in a register (service) rather than directly sending it as you would with a 232 connection.
Is that any where near correct ?
Some services seem to have defined addresses like perhaps the RSSI value. Some explanations additionally refer to attributes, profiles and descriptors, what they are is unclear.
Trying to establish two way data between an RN4870 module and android, the 4870 has a "transparent UART" service but how that works other than connecting to it is remaining a mystery.
As a basic concept does it work by effectively having a load of registers which are called services, in the service is the data which is called the characteristic.
So in simplistic terms, to exchange data once the two ends are connected : One end puts some data ( a characteristic) in a service, the other end polls the service and reads the data. When data is ready it has to be placed in a register (service) rather than directly sending it as you would with a 232 connection.
Is that any where near correct ?
Some services seem to have defined addresses like perhaps the RSSI value. Some explanations additionally refer to attributes, profiles and descriptors, what they are is unclear.
Trying to establish two way data between an RN4870 module and android, the 4870 has a "transparent UART" service but how that works other than connecting to it is remaining a mystery.
With some code written in B4A I can connect to the RN4870 but have no clue how to send and receive data. The module data sheet reveals a 35 character UUID for read and write using a "transparent UART" service but I have not been able to figure out what to do with the UUID. Attempting to send it as a string crashes my application.
Anybody have any experience of how this works or at least give me a clue ? Have been staring at it for a couple of weeks now.
Anybody have any experience of how this works or at least give me a clue ? Have been staring at it for a couple of weeks now.
Still struggling with understanding this. Out of the BLE sniffers suggested I have installed nRFmaster. With that I can see and connect to the RN4870 module and read rssi, manufacture, software version etc. but I am no where nearer to understanding how to send and receive data.
The module has a “Transparent UART” service, it seems this works by sending data as a notification and receiving data as a write without response. I guess that using notification avoids the remote end having to poll to see if there is data.
The data sheet tells me that the transparent service UUID is :-
49535343-FE7D-4AE5-8FA9-9FAFD205E455
and the characteristic properties are :-
UART TX 49535343-1E4D-4BD9-BA61-23C647249616 Notify,Write,write without response.
UART RX 49535343-8841-43F4-A8D4-ECBE34729BB3 Write,Write without response.
I can see the service and the characteristics listed using nRFmaster but still can't see how to send or receive anything. If I try to send the entire characteristic from b4a it crashes and I can't believe you need to tag the entire 32 characters on to each packet, the pay load I am trying to send and receive is just a string of 5 Ascii values every 500ms.
It is all so easy with rs232.
The module has a “Transparent UART” service, it seems this works by sending data as a notification and receiving data as a write without response. I guess that using notification avoids the remote end having to poll to see if there is data.
The data sheet tells me that the transparent service UUID is :-
49535343-FE7D-4AE5-8FA9-9FAFD205E455
and the characteristic properties are :-
UART TX 49535343-1E4D-4BD9-BA61-23C647249616 Notify,Write,write without response.
UART RX 49535343-8841-43F4-A8D4-ECBE34729BB3 Write,Write without response.
I can see the service and the characteristics listed using nRFmaster but still can't see how to send or receive anything. If I try to send the entire characteristic from b4a it crashes and I can't believe you need to tag the entire 32 characters on to each packet, the pay load I am trying to send and receive is just a string of 5 Ascii values every 500ms.
It is all so easy with rs232.
This may provide some help: https://www.argenox.com/library/bluetooth-low-ener...
Edited by nyt on Monday 3rd January 13:16
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