Differences

This shows you the differences between two versions of the page.

--- level2:communication_between_2_webhmis_via_internet [2022/02/08 14:06] – [Option 2. Using MQTT protocol] emozolyak
+++ level2:communication_between_2_webhmis_via_internet [2022/02/08 14:07] – [Option 2. VPN and Modbus TCP] emozolyak
@@ Line 9: / Line 9: @@
 With the WebHMI and Level2 connectivity options it is done with ease:
-==== Option 1. VPN and Modbus TCP =====
+==== Option 1. Using MQTT protocol ====
+  - Connect both WebHMIs to the Level2 IoT
+  - Subscribe the pump station WebHMI to the topic with level that far WebhMI publish onto the Level2 MQTT broker.
+==== Option 2. VPN and Modbus TCP =====
   -[[level2:how_to_connect_webhmi_to_level2|Connect both WebHMIs to Level2]] and and remember remote node (reservoir side) IP address in the VPN network
@@ Line 16: / Line 21: @@
   -Create Modbus TCP connection on the pump side WebHMI using IP address from (1)
+<WRAP center round tip 60%>
+__Option 1__ Is preffered due to the nature of the MQTT protcol which saves traffice for communication while Modbus TCP will create constatn polling process.
+</WRAP>