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--- integration_with_other_systems [2019/09/03 15:08] – emozolyak
+++ integration_with_other_systems [2021/04/28 07:58] – [Example - connecting to a remote module via its web server] emozolyak
@@ Line 54: / Line 54: @@
 </code>
+===== Implementing other requests like PUT =====
+To implement other requests, you can use special field in the cURL for the custom methods:
+<code lua>
+function main (userId)
+    INFO("Doing CURL");
+  str = ''
+  c = cURL.easy_init()
+  c:setopt_url("http://192.168.1.230:8000")
+  c:setopt_timeout(15)
+  c:setopt{[cURL.OPT_CUSTOMREQUEST] = "PUT"}  -- this is custom method
+  c:setopt{
+        [cURL.OPT_POSTFIELDS] = 'Content-type: text/html'
+  }
+  c:post({'THIS IS CONTENT OF THE PUT'})
+  c:perform({writefunction = function(res) str = res end })
+  c:close()
+  INFO("CURL done\n" .. str);
+end
+</code>
 ===== Example - connecting to a remote module via its web server =====
@@ Line 74: / Line 100: @@
 {{ ::json_viewer.png?direct&600 |}}
+===== Notes on cURL usage =====
+<WRAP center round important 60%>
+In the fw of 4.0 version, the following issue was reported:
+When there are multiple cURL requests from the WebHMI to the unavailable resource, a system crash may happen. The timeout settings won't affect the sysem behaviour. Use this feature with care when you need cyclical call of multiple cURLs in your scripts:
+  * use one script which detect availablity of the resource and locks following execution for a while
+  * use external watchdog circuit to reset WebHMI if you use it to control mission - critical system.
+</WRAP>