search items error

Dear Igor,

Thanks for your help but no success yet,
The SDK says:

Search items by property
For more complicated searches, the request core/search_items is used. For example, all users can be found by making the following request:https://hst-api.wialon.com/wialon/ajax.html?svc=core/search_items&
        params={
               "spec":{
                      "itemsType":"user",
                       "propName":"sys_name",
                       "propValueMask":"*",
                       "sortType":"sys_name"
               },
                "force":1,
               "flags":1,
               "from":0,
               "to":0
        }&sid=<your_sid>

Nevertheless, the results:

request:https://hst-api.wialon.com/wialon/ajax.html?svc=core%2Flogin&params=%7B%22user%22%3A%22eflottademo%22%2C%22password%22%3A%22demo2013%22%7D
response:{"host":"188.36.241.190","eid":"81f296768b1649abca0ee64c8fe00a89","au":"eflottademo","tm":1371750233,"user":{"nm":"eflottademo","cls":1,"id":156890,"prp":{"addr_provider":"map_webgis","cfmt":"0","dst":"-1","evt_flags":"2","fpnl":"monitoring","language":"hu","last_tail_points":"50","minimap_zoom_level":"15","mondv":"[\"156891_1\"]","mont":"1","monu":"[\"194822\",\"419681\",\"584670\"]","monuv":"[\"194822\",\"419681\",\"584670\"]","msc":"1","mtg":"1","mtgy":"0","mu_cmd_btn":"0","mu_delete_from_list":"0","mu_events":"0","mu_gps":"1","mu_gps_mode":"0","mu_gps_time":"0","mu_loc_mode":"0","mu_location":"0","mu_move":"1","mu_photo":"0","mu_tracks":"1","mu_tracks_ival":"0","mu_watch":"1","muf":"1027","muow":"584670","poil":"[\"156891_1\"]","radd":"{\"w\":\"4\",\"c\":0,\"u\":419681,\"a\":1,\"td\":1,\"s\":\"default\"}","show_log":"0","tz":"184749584","umap":"Google Streets","umsp":"19.2048823,47.61340164287031,8","ursstp":"0x17bf","us_addr_fmt":"1255211008_10_5","vsplit_block_left_panel":"381.4102478027344","vsplit_monitoring_map_target":"200","vsplit_report_templates_filter_target":"325","znsn":"1"},"crt":154093,"bact":156891,"fl":22,"hm":"","uacl":2097795},"classes":{"avl_hw":4,"avl_resource":3,"avl_retranslator":7,"avl_route":6,"avl_unit":2,"avl_unit_group":5,"user":1}}

request:https://hst-api.wialon.com/wialon/ajax.html?svc=core%2Fsearch_item&sid=&params=%7B%22spec%22%3A%7B%22itemsType%22%3A%22user%22%2C%22propName%22%3A%22sys_name%22%2C%22propValueMask%22%3A%22*%22%2C%22sortType%22%3A%22sys_name%22%7D%2C%22force%22%3A1%2C%22flags%22%3A1%2C%22from%22%3A0%2C%22to%22%3A0%7D

response: {"error":4}

Could you please send us an example req/resp from the login to the response with the unit IDs?
Many thanks in advance,
Gergely

As far as I understand, this request is made from your examples. What is the exact problem with it?