PubSub library compilation fails when Paho dependency is not provided
Compilation of the S2OPC PubSub library is failing when Paho MQTT library dependency is not provided. This was not the case prior to commit 97eb2e73. Therefore the issue is present in tags S2OPC_Toolkit_1.3.0, S2OPC_Toolkit_1.3.1 and S2OPC_Toolkit_1.4.0.
The non regression patch is to provide empty MQTT implementation when Paho MQTT library is not present.
The following issue is also created to treat the MQTT dependencies in S2OPC in a better way: #1157.
Edited by Vincent Monfort