agl-service-unicens: Rx message event

Bug-AGL: SPEC-1177

Implements /subscriberx function. Control Rx messages
will be notified to subscribers. If no subscriber is
assigned, then Rx messages are discarded. This avoids
Rx stuck issues after receiving multiple messages.

Change-Id: Idb71569b8ff6f651833d7d01c37a3eea866daf1d
Signed-off-by: Tobias Jahnke <tobias.jahnke@microchip.com>

1 files changed, 97 insertions, 4 deletions

diff --git a/ucs2-afb/ucs_binding.c b/ucs2-afb/ucs_binding.c
index b72aca9..553ed36 100644
--- a/ucs2-afb/ucs_binding.c
+++ b/ucs2-afb/ucs_binding.c
@@ -68,11 +68,15 @@ typedef struct {
 
 typedef struct {
     struct afb_event node_event;
-
 } EventData_t;
 
+typedef struct {
+    struct afb_event rx_event;
+} EventDataRx_t;
+
 static ucsContextT *ucsContextS = NULL;
 static EventData_t *eventData = NULL;
+static EventDataRx_t *eventDataRx = NULL;
 
 PUBLIC void UcsXml_CB_OnError(const char format[], uint16_t vargsCnt, ...) {
     /*AFB_DEBUG (afbIface, format, args); */
@@ -208,12 +212,74 @@ void UCSI_CB_OnStop(void *pTag) {
    sd_event_add_time(afb_daemon_get_event_loop(), NULL, CLOCK_MONOTONIC, 0, 0, OnStopCB, pTag);
 }
 
+/* helper function: wraps Rx message in json and triggers notification */
+STATIC void NotifyEventRxMsg(uint16_t src_addr, uint16_t msg_id, uint8_t *data_ptr, uint32_t data_sz) {
+
+    if (!eventDataRx)
+        return;
+
+    if (data_sz > CTRL_MAX_DATA_SZ) {
+        AFB_NOTICE("RX-MSG: discarded, payload exceeds %d bytes", CTRL_MAX_DATA_SZ);
+        return;
+    }
+
+    json_object *j_event_info = json_object_new_object();
+    json_object *j_array = json_object_new_array();
+
+    if (!j_event_info || !j_array) {
+        if (j_event_info) {
+            json_object_put(j_event_info);
+        }
+        if (j_array) {
+            json_object_put(j_array);
+        }
+        AFB_ERROR("Failed to create json objects");
+        return;
+    }
+
+    uint32_t cnt = 0U;
+    for (cnt = 0U; cnt < data_sz; cnt++) {
+        json_object_array_add(j_array, json_object_new_int(data_ptr[cnt]));
+    }
+
+    json_object_object_add(j_event_info, "node", json_object_new_int(src_addr));
+    json_object_object_add(j_event_info, "msgid", json_object_new_int(msg_id));
+    json_object_object_add(j_event_info, "data", j_array);
+
+    afb_event_push(eventDataRx->rx_event, j_event_info);
+}
+
+/** Asynchronous processing of Rx messages in mainloop is recommended */
+STATIC int OnAmsMessageReceivedCB (sd_event_source *source, void *pTag) {
+    ucsContextT *ucsContext = (ucsContextT*) pTag;
+    uint32_t data_sz = 0U;
+    uint8_t *data_ptr = NULL;
+    uint16_t msg_id = 0U;
+    uint16_t src_addr = 0U;
+
+    while (UCSI_GetAmsMessage(&ucsContext->ucsiData, &msg_id, &src_addr, &data_ptr, &data_sz)) {
+        NotifyEventRxMsg(src_addr, msg_id, data_ptr, data_sz);
+        AFB_DEBUG("RX-MSG: src=0x%04X, msg_id=0x%04X, size=%d", src_addr, msg_id, data_sz);
+        UCSI_ReleaseAmsMessage(&ucsContext->ucsiData);
+    }
+
+    return 0;
+}
+
 /** This callback will be raised, when ever an applicative message on the control channel arrived */
 void UCSI_CB_OnAmsMessageReceived(void *pTag)
 {
-	/* If not interested, just ignore this event.
-	   Otherwise UCSI_GetAmsMessage may now be called asynchronous (mainloop) to get the content.
-	   Don't forget to call UCSI_ReleaseAmsMessage after that */
+    static sd_event_source *src_ptr = NULL;
+
+    if (!src_ptr)
+    {
+        /* first time usage: create and trigger event source */
+        sd_event_add_defer(afb_daemon_get_event_loop(), &src_ptr, &OnAmsMessageReceivedCB, pTag);
+    }
+    else
+    {
+        sd_event_source_set_enabled(src_ptr, SD_EVENT_ONESHOT);
+    }
 }
 
 void UCSI_CB_OnRouteResult(void *pTag, uint16_t routeId, bool isActive, uint16_t connectionLabel)
@@ -511,6 +577,33 @@ OnExitError:
     return;
 }
 
+PUBLIC void ucs2_subscriberx (struct afb_req request) {
+
+    if (!eventDataRx) {
+
+        eventDataRx = malloc(sizeof(EventDataRx_t));
+        if (eventDataRx) {
+            eventDataRx->rx_event = afb_daemon_make_event("rx-message");
+        }
+
+        if (!eventDataRx || !afb_event_is_valid(eventDataRx->rx_event)) {
+            afb_req_fail_f(request, "create-event", "Cannot create or register event");
+            goto OnExitError;
+        }
+    }
+
+    if (afb_req_subscribe(request, eventDataRx->rx_event) != 0) {
+
+        afb_req_fail_f (request, "subscribe-event", "Cannot subscribe to event");
+        goto OnExitError;
+    }
+
+    afb_req_success(request,NULL,"event subscription successful");
+
+OnExitError:
+    return;
+}
+
 static json_object * ucs2_validate_command (struct afb_req request,
         const char* func_name) {