Iphone subscription question

stephenlam

I'm trial iStreamLight with Lightstreamer Vivace. I found that when my subscription item changed on Iphone. Iphone occasional (not everytime, the rate approx. 1/50) received update value of 1st item and 2nd item at same time. Below please find my subscription flow and Lightstreamer server log.

Flow:
1. Subscribe item 410
2. Unsubscribe 410
3. Subscribe item 410
4. Unsubscribe 410
5. Subscribe item 811
6. Unsubscribe 811
7. Subscribe item 811

Eventually Iphone received both 410 and 811 values mixed to my last subscription, e.g. Nominal, ShareTraded, etc.

Am I doing something wrong?

Lightstreamer.log:
10-Mar-10 15:21:20,738 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 1     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=add&LS_id1=410&LS_schema1=StockCode%20Nominal%20StockChiName%20Net%20ShareTraded%20Turnover%20BidPrice%20HighPrice%20OpenPrice%20AskPrice%20LowPrice%20PrevClosePrice%20YearLow%20YearHigh%20LotSize%20PE%20NetPercentage%20SuspStock%20Nature%20Div%20Ymd%20ExpDate%20ExerPrice%20Premium%20Gearing%20Ratio%20CallPrice%20ASK_SHARE_1%20ASK_SHARE_2%20ASK_SHARE_3%20ASK_SHARE_4%20ASK_SHARE_5%20ASK_QUEUE_1%20ASK_QUEUE_2%20ASK_QUEUE_3%20ASK_QUEUE_4%20ASK_QUEUE_5%20BID_SHARE_1%20BID_SHARE_2%20BID_SHARE_3%20BID_SHARE_4%20BID_SHARE_5%20BID_QUEUE_1%20BID_QUEUE_2%20BID_QUEUE_3%20BID_QUEUE_4%20BID_QUEUE_5%20Timestamp%20ProfitPerShare%20TradeTicker1%20TradeTicker2%20TradeTicker3%20TradeTicker4%20TradeTicker5%20BrokerQueueAskSpread%20BrokerQueueBidSpread&LS_data_adapter1=TELETEXT&LS_mode1=MERGE&LS_requested_max_frequency1=1.00&LS_snapshot1=true from xxx.xxx.xxx.xxx:49808
10-Mar-10 15:21:20,738 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 1     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49808
10-Mar-10 15:21:20,739 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 4     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49808
10-Mar-10 15:21:23,733 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 10    |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49808
10-Mar-10 15:21:42,221 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 9     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49810
10-Mar-10 15:21:42,223 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 3     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=delete from xxx.xxx.xxx.xxx:49810
10-Mar-10 15:21:42,224 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 3     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49810
10-Mar-10 15:21:42,224 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 2     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49810
10-Mar-10 15:21:45,235 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 5     |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49810
10-Mar-10 15:21:47,760 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 8     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49812
10-Mar-10 15:21:47,762 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 4     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=add&LS_id1=410&LS_schema1=StockCode%20Nominal%20StockChiName%20Net%20ShareTraded%20Turnover%20BidPrice%20HighPrice%20OpenPrice%20AskPrice%20LowPrice%20PrevClosePrice%20YearLow%20YearHigh%20LotSize%20PE%20NetPercentage%20SuspStock%20Nature%20Div%20Ymd%20ExpDate%20ExerPrice%20Premium%20Gearing%20Ratio%20CallPrice%20ASK_SHARE_1%20ASK_SHARE_2%20ASK_SHARE_3%20ASK_SHARE_4%20ASK_SHARE_5%20ASK_QUEUE_1%20ASK_QUEUE_2%20ASK_QUEUE_3%20ASK_QUEUE_4%20ASK_QUEUE_5%20BID_SHARE_1%20BID_SHARE_2%20BID_SHARE_3%20BID_SHARE_4%20BID_SHARE_5%20BID_QUEUE_1%20BID_QUEUE_2%20BID_QUEUE_3%20BID_QUEUE_4%20BID_QUEUE_5%20Timestamp%20ProfitPerShare%20TradeTicker1%20TradeTicker2%20TradeTicker3%20TradeTicker4%20TradeTicker5%20BrokerQueueAskSpread%20BrokerQueueBidSpread&LS_data_adapter1=TELETEXT&LS_mode1=MERGE&LS_requested_max_frequency1=1.00&LS_snapshot1=true from xxx.xxx.xxx.xxx:49812
10-Mar-10 15:21:47,762 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 4     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49812
10-Mar-10 15:21:47,763 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 4     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49812
10-Mar-10 15:21:50,757 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 10    |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49812
10-Mar-10 15:21:58,811 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 9     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49814
10-Mar-10 15:21:58,814 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 3     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=delete from xxx.xxx.xxx.xxx:49814
10-Mar-10 15:21:58,815 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 3     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49814
10-Mar-10 15:21:58,815 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 3     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49814
10-Mar-10 15:22:01,804 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 6     |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49814
10-Mar-10 15:22:43,614 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 8     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49821
10-Mar-10 15:22:43,618 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 4     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=add&LS_id1=811&LS_schema1=StockCode%20Nominal%20StockChiName%20Net%20ShareTraded%20Turnover%20BidPrice%20HighPrice%20OpenPrice%20AskPrice%20LowPrice%20PrevClosePrice%20YearLow%20YearHigh%20LotSize%20PE%20NetPercentage%20SuspStock%20Nature%20Div%20Ymd%20ExpDate%20ExerPrice%20Premium%20Gearing%20Ratio%20CallPrice%20ASK_SHARE_1%20ASK_SHARE_2%20ASK_SHARE_3%20ASK_SHARE_4%20ASK_SHARE_5%20ASK_QUEUE_1%20ASK_QUEUE_2%20ASK_QUEUE_3%20ASK_QUEUE_4%20ASK_QUEUE_5%20BID_SHARE_1%20BID_SHARE_2%20BID_SHARE_3%20BID_SHARE_4%20BID_SHARE_5%20BID_QUEUE_1%20BID_QUEUE_2%20BID_QUEUE_3%20BID_QUEUE_4%20BID_QUEUE_5%20Timestamp%20ProfitPerShare%20TradeTicker1%20TradeTicker2%20TradeTicker3%20TradeTicker4%20TradeTicker5%20BrokerQueueAskSpread%20BrokerQueueBidSpread&LS_data_adapter1=TELETEXT&LS_mode1=MERGE&LS_requested_max_frequency1=1.00&LS_snapshot1=true from xxx.xxx.xxx.xxx:49821
10-Mar-10 15:22:43,618 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 4     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49821
10-Mar-10 15:22:43,618 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 4     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49821
10-Mar-10 15:22:47,547 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 10    |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49821
10-Mar-10 15:23:07,221 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 9     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49823
10-Mar-10 15:23:07,222 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 2     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=delete from xxx.xxx.xxx.xxx:49823
10-Mar-10 15:23:07,223 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 2     |Controlling session: S4c92816b2eb62342T2108542 from xxx.xxx.xxx.xxx:49823
10-Mar-10 15:23:07,223 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 2     |Reused HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49823
10-Mar-10 15:23:11,193 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 5     |Closed HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49823
10-Mar-10 15:23:36,246 |INFO |LightstreamerLogger.connections  |SERVER POOLED THREAD 8     |Accepted HTTP connection on Lightstreamer HTTP Server from xxx.xxx.xxx.xxx:49826
10-Mar-10 15:23:36,248 |INFO |LightstreamerLogger.requests     |SERVER POOLED THREAD 4     |Serving request: /lightstreamer/control.txt?LS_session=S4c92816b2eb62342T2108542&LS_window=50&LS_op=add&LS_id1=811&LS_schema1=StockCode%20Nominal%20StockChiName%20Net%20ShareTraded%20Turnover%20BidPrice%20HighPrice%20OpenPrice%20AskPrice%20LowPrice%20PrevClosePrice%20YearLow%20YearHigh%20LotSize%20PE%20NetPercentage%20SuspStock%20Nature%20Div%20Ymd%20ExpDate%20ExerPrice%20Premium%20Gearing%20Ratio%20CallPrice%20ASK_SHARE_1%20ASK_SHARE_2%20ASK_SHARE_3%20ASK_SHARE_4%20ASK_SHARE_5%20ASK_QUEUE_1%20ASK_QUEUE_2%20ASK_QUEUE_3%20ASK_QUEUE_4%20ASK_QUEUE_5%20BID_SHARE_1%20BID_SHARE_2%20BID_SHARE_3%20BID_SHARE_4%20BID_SHARE_5%20BID_QUEUE_1%20BID_QUEUE_2%20BID_QUEUE_3%20BID_QUEUE_4%20BID_QUEUE_5%20Timestamp%20ProfitPerShare%20TradeTicker1%20TradeTicker2%20TradeTicker3%20TradeTicker4%20TradeTicker5%20BrokerQueueAskSpread%20BrokerQueueBidSpread&LS_data_adapter1=TELETEXT&LS_mode1=MERGE&LS_requested_max_frequency1=1.00&LS_snapshot1=true from xxx.xxx.xxx.xxx:49826

Thanks!

Stephen Lam

Dario Crivelli

How can you identify whether the received updates are from 410 or 811?
Only by the item reference supplied by the API interface, or also by the field values?

I see that the subscription and unsubscription requests are very well separated,
so it doesn't seem likely that updates from a previous subscription are delayed.
What about the "timestamp" field of the updates that shouldn't have occurred?

For a server-side check, you could enable logging of the update flow.
Please set the priority of the LightstreamerLogger.subscriptionsand LightstreamerLogger.pump categories to DEBUG.
This will allow you to trace the unexpected update events.

stephenlam

Thanks DarioCrivelli,

I found the cause of problem. Because our Iphone client created two sessions and both subscirbed to Lightstreamer server with same window ID. One subscribed item A and the other subscribed item B. Our Iphone client use window ID for identify each item. Therefore I received two items mixed. It seems to be our bug. Thanks for your help.

Best Regards,
Stephen Lam