CCS/LP-CC2652RB: Data transfer from android smartphone to cc2652LP serial port using BLE Scanner app

You can refer to Task 3 - Get Notified in tutorial dev.ti.com/.../ble_01_basic.html to use notification to send char or string to Andriod App.

Task 3 is for Btool , but i am using mobile device. However that is button state, whereas i am using the last service with characteristic (UUID starts with F0001131) i.e. the data service. How can i enable notifications for the data service as the service corresponding to data in BLE scanner app doesn't have N (notification enable feature in the UI) whereas button service has it.

Thanks,

Shivam

If you check 4th custom characteristic in CUSTOM SERVICE of BLE Scanner, you will see a "N" icon. After you click on the "N" icon, it would enable notification.

You mean the 4th custom service or the custom service with F0001130 uuid. Yes both of them have "N". But how do i read the data from serial port in the android app, when i am trying to write anything it doesn't get written on the serial port.

However when i write it on android app UI, it goes to serial port after i perform Write operation by clicking 'W'.

Notification means device would send characteristic to Andriod App. For printing it on Android, it’s out of topic of this E2E forum and I suppose you have to do it by yourself.

NO, No it is not out of topic of this E2E forum. Every time you are saying the same thing. 

It is not about printing on android. Its about reading from, how and what notification it is sending.

First of all there is no 4th custom characteristic in any of the service in BLE scanner.

My question is suppose i want to read char string from LP  using string char/stream char of data service, then how will that string char/stream char be passed in project zero code? To be specific how can i verify data service of project zero from LP to android smartphone as i am able to do it from android smartphone to LP but not vice-versa?

Please help me i am really stuck.

Hi,

Here is the GATT table used by the poject zero:

I guess the suggestion was to use the characteristic starting with F0001132.

At least, can you try to use the characteristic starting with F0001132?

Best regards,

Hi, Thanks for your response.

I am using the same characteristic you have mentioned. And i have verified the data transfer from android to LP serial post by writing some text char in the Write window, but how can i write it from the launchpad. Please refer the attached images.

HI please refer the screenshots below, these are from project zero link 

https://dev.ti.com/tirex/content/simplelink_academy_cc2640r2sdk_2_30_02_00/modules/blestack/ble_01_basic/ble_01_basic.html

I want to enable notifications and update them without input from mobile device. Please see it in the attached image. I have circled the concerned portion.

Also tell me if i am on right track to send large amount of data from LP to Android app.

Hi,

I think using the notifications is the proper way to solve your issue.

You can follow the SimpleLink Academy labs you have found.

Let me know if you have more questions.

Regards,

Okay Thanks clement, i will follow the lab.

But i just want one thing how will i write a characteristic from LP side after i set the notifications as enable.

regards,

shivam

Okay, can you tell me one thing how can i write or change values of a characteristic from the LP side (i.e. the peripheral side) after i enable the notifications.

Thanks in advance

You can refer to DataService_SetParameter in project_zero.

Thanks YK for your response.
Further, i am following bluetooth low energy custom profile of this link http://software-dl.ti.com/lprf/simplelink_academy/modules/ble_01_custom_profile/ble_01_custom_profile.html.

In this for completing steps 4 & 5 of task 2, where i have to add the  SunlightService_AddService(); in the ProjectZero_init() section. Do i have to add the full generated appsnippets.c file in the project or only the code part of appsnippets.c in the ProjectZero_init() section or i just have to add the SunlightService_AddService(); along with other services as shown in the attachment.

Please help me i am just a beginner.

What is generated appsnippets.c file?

It is given here in the blecustomprofile tutorial. You can see the attachment.

You can copy the codes to implement this.

Yes that's what i am asking, do i have to copy the whole code or just the line SunlightService_AddService();along with other services in the initialization section in projectzero.c . Please see the steps 4&5 of task2 in Bluetooth custom profile in this link software-dl.ti.com/.../ble_01_custom_profile.html  How to implement these steps, is not given clearly in the tutorial.

Thanks for the link YK. The steps 4 & 5 are almost same for both the links. Can you please elaborate how to complete these steps as i am unable to find the service initialization segment of ProjectZero_init() and Insert the SunlightService_AddService(...); snippet from the application-snippets.c under Example service generator there.

My question is what part of code i have to insert and where exactly?

Please help me.

I usually do this manually and don't use Example service generator. I suggest you to following task 1 to 6 to make this work.

That is okay YK, i got it but my question is different. I am following task 1 to 6 only. I am just asking where in the code of project zero.c i have to insert the sunlighService_addservice(); from appsnippets.c and how much i have to add there?

According to task 1, you can create sunlightService.c and sunlightService.h files in your project_zero and copy the source codes provide in task 1 to those two files. Then, added code by searching for SOLUTION in the project_zero tab to add related code into project_zero.c.

Okay, i got it. What about the step 5 in task 2?

How to implement it? Where exactly it is to be inserted?

Thanks for your help YK.

It's just copy those lines with SOLUTION mark into your project_zero.c.

Okay do i have to add the lines with solution only or the complete code block with + as prefix is to be added? See the image attached below.

Add the lines with solution only.

So what about the code blocks with solution begin and solution end. What are they for? Please refer the attached images?

You also have to add code blocks with solution begin and solution end.

Okay and what about this? Please see the attached image?

Add too.

After adding the code blocks in Solution , i am getting the errors as shown in the attached image. Please let me know how to remove them as when i am including the #include "sunlightService.h"  , i am getting an error that unable to open the file. I have created the sunlightService.h & sunlightService.c file in service folder in the application folder of the sunlightperipheral project.

1. You don't define SUNLIGHTSERVICE_SUNLIGHTVALUE_ID/SUNLIGHTSERVICE_SUNLIGHTVALUE_LEN/SUNLIGHTSERVICE_UPDATEPERIOD_ID/SUNLIGHTSERVICE_UPDATEPERIOD_LEN in sunlightService.h

2. You miss adding the following lines to your project_zero.c.

+// SOLUTION: Sunlight Service callback handler.
+// The type Data_ServiceCBs_t is defined in sunlightService.h
+static sunlightServiceCBs_t ProjectZero_Sunlight_ServiceCBs = {
+    .pfnChangeCb = sunCharChanged,
+    .pfnCfgChangeCb = NULL
+};

I suggest you to read the SimpleLink more carefully to get every step done.

Dear YK,

Many Thanks for your suggestion, but i have added the code part in my project_zero.c that you have mentioned above in your reply. Please see the attached images and the code file for my project_zero.c. 
I am reading the simplelink tutorial very carefully, but somehow i feel that the simple link platform is not clearly explained so that it can be  completed without confusions.

That's why i am seeking your help. I want to use this BLE feature of Simplelink controllers in my project.

This my screenshot of my project_zero.c

Projectzero.c.txt

I tried the steps and I can build the task without problem. I attach my sunlightService.c, sunlightService.h, and project_zero.c for your reference.

0218.Application.zip

In the task 1, is it required to add a new folder called services or i can directly create sunlightservice.h & sunlightservice.c in the application folder. Please see the highlighted portion in the attached image.

You can directly create sunlightservice.h & sunlightservice.c in the application folder

The code compiles now without any errors. But what is the service initialization segment of ProjectZero_init() and where in the code it is located. How can i perform the steps 4 & 5 of task 2. Please see the attached image.

Add "SunlightService_AddService( selfEntity ); // SOLUTION" right after the line "DataService_AddService(selfEntity);" in ProjectZero_init().

Okay Thanks and what about the 6th step in the shown image, there is no application/services directory in my project as i have added the sunlightservice.c and sunlightservice.h directly in the application folder of the project. Do i need to add this path in the include options as its already added as shown in the second attached image.

If you added the sunlightservice.c and sunlightservice.h directly in the application folder of the project, you don't have to do this step.

Yes , when i am downloading the program in my device, the service is not visible. The service will be shown by the name of sunlightservice right?
Though i am getting 5 services after scan and connection.

What BLE central do you use to scan and connect to the project_zero with sunlightservice?

I am using the BLE scanner android application in an android smartphone as the ble central.

Sometimes smartphone BLE driver would cache the information so you can try to turn off BLE and turn on BLE again or restart your smartphone to clear cache to try again.

Yes YK, i tried this by manually clearing the BLE scanner's cache myself. But still it's not working. Can you tell me one thing after downloading the program onto the LP, i will get service by the name of sunlighservice right?

You won't see sunlighservice as name. You can see CUSTOM SERVICE 0xBA55 which is sunlighservice.

Please see the screenshot of my result and let me know whether its right? I am also facing one more issue, after some time the LP becomes undiscoverable in the BLE scanner app and it becomes available again when i download the program again onto the launchpad. Why is this problem, do i have to download the program every time when i have to connect with the smartphone?

It looks correct. My screenshot is from iOS and it might be different to Android system. Before you download project_zero to test it, do you also download BIM into your launchpad?

Yes i had downloaded BIM_offchip once before downloading Project_zero but i dont do it everytime. Please see the screenshot of the BIM i have downloaded.