Added fints4k option appendFinTsMessagesToLog to easily configure if FinTS messages should get added to log

FinTs4jBankingClient/src/commonMain/kotlin/net/codinux/banking/client/fints4k/FinTs4kBankingClient.kt

@@ -21,7 +21,7 @@ open class FinTs4kBankingClient(
     constructor(callback: BankingClientCallback) : this(FinTsClientConfiguration(), callback)
 
     constructor(options: FinTsClientOptions, callback: BankingClientCallback)
-            : this(FinTsClientConfiguration(net.codinux.banking.fints.config.FinTsClientOptions(options.collectMessageLog, false, options.removeSensitiveDataFromMessageLog, options.closeDialogs, options.version, options.productName)), callback)
+            : this(FinTsClientConfiguration(net.codinux.banking.fints.config.FinTsClientOptions(options.collectMessageLog, false, options.removeSensitiveDataFromMessageLog, options.appendFinTsMessagesToLog, options.closeDialogs, options.version, options.productName)), callback)
 
 
     protected open val mapper = FinTs4kMapper()

FinTs4jBankingClient/src/commonMain/kotlin/net/codinux/banking/client/fints4k/FinTsClientOptions.kt

@@ -24,6 +24,8 @@ data class FinTsClientOptions(
      */
     val removeSensitiveDataFromMessageLog: Boolean = true,
 
+    val appendFinTsMessagesToLog: Boolean = false,
+
     val closeDialogs: Boolean = true,
 
     val version: String = "1.0.0", // TODO: get version dynamically

README.md

@@ -167,4 +167,22 @@ fun updateAccountTransactions() {
         }
     }
 }
-```
+```
+
+## Logging
+
+BankingClient and fints4k both use [klf](https://github.com/codinux-gmbh/klf), a logging facade for Kotlin (Multiplatform)
+with appenders for all supported KMP platforms.     
+So logging works on all platforms out of the box. On JVM, if slf4j is on the classpath, logging can be configured with
+any slf4j compatible logging backend (logback, log4j, JBoss Logging, ...).
+
+If you want to see all sent and received FinTS messages, set the log level of `net.codinux.banking.fints.log.MessageLogCollector` to `DEBUG`, either via:
+- your logging framework (e.g. logback)
+- klf: `net.codinux.log.LoggerFactory.getLogger("net.codinux.banking.fints.log.MessageLogCollector").level = LogLevel.Debug`
+- `appendFinTsMessagesToLog` option:
+```kotlin
+val client = FinTs4kBankingClient(FinTsClientOptions(appendFinTsMessagesToLog = true), SimpleBankingClientCallback())
+```
+But be aware, in latter case if you create multiple FinTs4kBankingClient instances, the latest value of `appendFinTsMessagesToLog` 
+overrides the value of all previous FinTs4kBankingClient instances. As with all other options, this configures the logger's level globally,
+so the latest configured log level value wins.