Embedded C SDK: Not Getting SHADOW_ACKs, only SHADOW_TIMEOUTs -- aws_iot_shadow functions not triggering Callback Function

I have been referred here by TI Support given that my issue seems to be caused by AWS Embedded C SDK. I am using CC3235S evaluation board.

I have had success publishing, subscribing, and updating, Shadows/Topics but receiving JSON payloads from a published topic has been a challenge. I am setting breakpoints in my callback function, and they are never being hit, unless I set my timeout seconds to 0, which results in an immediate timeout. The callback is expected to be called upon Timeout, Rejected, or Accepted statuses.

My thing/shadow/get/accepted Topic IS Publishing. The problem is that I'm unable to capture it into my Microcontroller.

I also can tell you that my AWS Iot Core / Thing policies are not the problem. I have set my permissions as loose as possible for testing.

I have Confirmed that the client IS Subscribing to the /shadow/get/rejected + /accepted topics, and I've confirmed that the Shadow is getting updated form my Device/Thing.

I have tried:

• Adding aws_iot_shadow_yield() / aws_iot_mqtt_yield() after my GET and UPDATE functions
• Different timeouts
• Setting persistent subscribe argument to true and false
• Adjusting permissions then reverting them back to known good

The Return Code always returns SUCCESS for all my aws functions within this routine, and during the GET function I have confirmed that the client IS Connected to AWS.

My GET Function:

IoT_Error_t rcGS;

rcGS = aws_iot_shadow_get(&client, AWS_IOT_MY_THING_NAME, getShadowCallback, NULL, 5, true);

My GET function Callback:

static void getShadowCallback(const char *pThingName, ShadowActions_t action, Shadow_Ack_Status_t status,
        const char *pReceivedJsonDocument, void *pContextData){

    IOT_UNUSED(action);
    IOT_UNUSED(pContextData);
    IOT_UNUSED(pReceivedJsonDocument);
    IOT_UNUSED(pThingName);
    
    nop; // breakpoint

    if (SHADOW_ACK_TIMEOUT == status) {
        IOT_INFO("GET Timeout--");
    } else if (SHADOW_ACK_REJECTED == status) {
        IOT_INFO("GET RejectedXX");
    } else if (SHADOW_ACK_ACCEPTED == status) {
        IOT_INFO("GET Accepted !!");
        GetFromAWS = true;
    }else{
        IOT_INFO("Unknown Update Status");
    }

}

I appreciate any help. Thank you.