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pass empty json on null method payload #2097

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merged 2 commits into from
Oct 1, 2021
Merged

pass empty json on null method payload #2097

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9e03329
add empty json with null payload
danewalton-msft Oct 1, 2021
7ad3ff7
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danewalton-msft Oct 1, 2021
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8 changes: 8 additions & 0 deletions iothub_client/src/iothub_client_core.c
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Original file line number Diff line number Diff line change
Expand Up @@ -26,6 +26,7 @@

#define DO_WORK_FREQ_DEFAULT 1
#define DO_WORK_MAXIMUM_ALLOWED_FREQUENCY 100
#define CLIENT_CORE_METHOD_EMPTY_PAYLOAD "{}"

struct IOTHUB_QUEUE_CONTEXT_TAG;

Expand Down Expand Up @@ -385,6 +386,13 @@ static int iothub_ll_device_method_callback(const char* method_name, const unsig
USER_CALLBACK_INFO queue_cb_info;
queue_cb_info.type = CALLBACK_TYPE_DEVICE_METHOD;

// A NULL payload was sent from the service. Use empty JSON to signal to the user no payload.
if(size == 0)
{
payload = (const unsigned char*) CLIENT_CORE_METHOD_EMPTY_PAYLOAD;
size = strlen(CLIENT_CORE_METHOD_EMPTY_PAYLOAD);
}

result = make_method_calback_queue_context(&queue_cb_info, method_name, payload, size, method_id, queue_context);
if (result != 0)
{
Expand Down