How to define objectLists for AJTC

asked 2014-08-26 00:46:58 -0700

congtam gravatar image

updated 2014-08-26 08:51:03 -0700

Hi everyone,

I'm trying to create an application with multi services for AJTC on Arduino. In fact, I want to create 2 services on Arduino ( one to turn on/off a led, another to blink the led). Since a service is presented by its object and its interface, I have two objects correspondings to two services. I created these objects in a objectLists such as:

static const AJ_Object AppObjects[] = {
{"/org/alljoyn/sample/measure/test1", testInterfaces },
{ NULL }

static const AJ_Object AppObjects_2[] = {
{"/org/alljoyn/sample/measure/test2", testInterfaces_2 },
{ NULL }

static const AJ_Object ObjectList[]={AppObjects, AppObjects_2};// there is always error

Then I called the method:

 uint8_t i = 3;// bs index has to be more than 2

But I couldn't arrived, there's always the error on the line ObjectList[]. Or we can define the ObjectsLists like:

static const AJ_Object AppObjects[] = {
{"/org/alljoyn/sample/measure/test1", testInterfaces },
{"/org/alljoyn/sample/measure/test2", testInterfaces_2 },
{ NULL }

Then we register it with:

AJ_RegisterObjects(AppObjects, NULL);

I have tried with the second way. For the first Interface(service) it works, but for the second, the command from phone to Arduino is rejected by Arduino. I would like to show the following captured packet: rejected_command.png Does anybody know to declare two objects in AJTC? Could you help me please? Thanks

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answered 2014-09-03 09:13:53 -0700

alphaemmeo gravatar image

Hi congtam, the sequence (1,0,0) is correct because you used two different path.

For example, looking the definition of AJ_APP_MESSAGE_ID we have:

#define AJ_APP_MESSAGE_ID (p,i,m )


  • p is the index of the object path in AppObjects (in your case you have two choices: "0" for "/org/alljoyn/sample/measure/test1" and 1 for "/org/alljoyn/sample/measure/test2" )
  • i is the interface index for each index path chosen above
  • m is the member index for each index i

I hope I was clear enough

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Thank very much for the reply, this is very useful :)

congtam ( 2014-09-05 07:42:49 -0700 )edit

you're welcome.

alphaemmeo ( 2014-09-05 08:08:09 -0700 )edit

answered 2014-09-02 00:59:39 -0700

congtam gravatar image

Hi everyone, I have found my problem. For 2 services on AJTC, we use the second method above to declare the objects and the interfaces like:

static const AJ_Object AppObjects[] = {{"/org/alljoyn/sample/measure/test1", testInterfaces },{"/org/alljoy/sample/measure/test2", testInterfaces_2 },{ NULL }};

My problem is that I used the message_ID (0,1,0) for the second service's method, so it is refused. I don't know exact reason, I think that this ID is used by Alljoyn platform. I have changed it to (1,0,0), and it works now. Does anybody know the exact reason? Could you please explain it to me?


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Asked: 2014-08-26 00:46:58 -0700

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Last updated: Sep 03 '14