fona.setNetworkSetting() using variables

[SashCuaz]

Hi dear,
I would like to set the network apn from a external app, we save the data in a json config file as strings and we tried to use the function fona.setNetworkSettings in order to apply the changes. After we are triying to do that, the compiler does not let us to set the values like pointer (const char *), It is posible to use the function with variables like from APN, USER and PASS?