diff --git a/linux/gpio/LinuxLibgpioIF.cpp b/linux/gpio/LinuxLibgpioIF.cpp
index 2a645fc..cfdac2b 100644
--- a/linux/gpio/LinuxLibgpioIF.cpp
+++ b/linux/gpio/LinuxLibgpioIF.cpp
@@ -155,6 +155,7 @@ ReturnValue_t LinuxLibgpioIF::pullHigh(gpioId_t gpioId) {
         }
         gpioCallback->callback(gpioMapIter->first, gpio::GpioOperation::WRITE,
                 1, gpioCallback->callbackArgs);
+        return RETURN_OK;
     }
     return GPIO_TYPE_FAILURE;
 }
@@ -176,6 +177,7 @@ ReturnValue_t LinuxLibgpioIF::pullLow(gpioId_t gpioId) {
         }
         gpioCallback->callback(gpioMapIter->first, gpio::GpioOperation::WRITE,
                 0, gpioCallback->callbackArgs);
+        return RETURN_OK;
     }
     return GPIO_TYPE_FAILURE;
 }
diff --git a/linux/i2c/I2cComIF.cpp b/linux/i2c/I2cComIF.cpp
index a88b019..aa336c7 100644
--- a/linux/i2c/I2cComIF.cpp
+++ b/linux/i2c/I2cComIF.cpp
@@ -147,7 +147,6 @@ ReturnValue_t I2cComIF::requestReceiveMessage(CookieIF *cookie,
     uint8_t* replyBuffer = i2cDeviceMapIter->second.replyBuffer.data();
 
     int readLen = read(fd, replyBuffer, requestLen);
-
     if (readLen != static_cast<int>(requestLen)) {
 #if FSFW_VERBOSE_LEVEL >= 1 and FSFW_CPP_OSTREAM_ENABLED == 1
         sif::error << "I2cComIF::requestReceiveMessage: Reading from I2C "
@@ -157,6 +156,7 @@ ReturnValue_t I2cComIF::requestReceiveMessage(CookieIF *cookie,
                 << requestLen << " bytes" << std::endl;
 #endif
         i2cDeviceMapIter->second.replyLen = 0;
+        sif::debug << "I2cComIF::requestReceiveMessage: Read "  << readLen << " of " << requestLen << " bytes" << std::endl;
         return HasReturnvaluesIF::RETURN_FAILED;
     }
 
diff --git a/linux/spi/SpiComIF.h b/linux/spi/SpiComIF.h
index 13f7603..676c7cb 100644
--- a/linux/spi/SpiComIF.h
+++ b/linux/spi/SpiComIF.h
@@ -64,6 +64,8 @@ public:
     void setSpiSpeedAndMode(int spiFd, spi::SpiModes mode, uint32_t speed);
     void performSpiWiretapping(SpiCookie* spiCookie);
 
+    ReturnValue_t getReadBuffer(address_t spiAddress, uint8_t** buffer);
+
 private:
 
     struct SpiInstance {
@@ -83,8 +85,6 @@ private:
     SpiDeviceMap spiDeviceMap;
 
     ReturnValue_t performHalfDuplexReception(SpiCookie* spiCookie);
-
-    ReturnValue_t getReadBuffer(address_t spiAddress, uint8_t** buffer);
 };
 
 #endif /* LINUX_SPI_SPICOMIF_H_ */
diff --git a/linux/spi/SpiCookie.cpp b/linux/spi/SpiCookie.cpp
index 15ba3e9..e34ea36 100644
--- a/linux/spi/SpiCookie.cpp
+++ b/linux/spi/SpiCookie.cpp
@@ -105,6 +105,10 @@ void SpiCookie::setCallbackMode(spi::send_callback_function_t callback,
     this->callbackArgs = args;
 }
 
+void SpiCookie::setCallbackArgs(void *args) {
+    this->callbackArgs = args;
+}
+
 spi_ioc_transfer* SpiCookie::getTransferStructHandle() {
     return &spiTransferStruct;
 }
diff --git a/linux/spi/SpiCookie.h b/linux/spi/SpiCookie.h
index 174ca9e..acf7c77 100644
--- a/linux/spi/SpiCookie.h
+++ b/linux/spi/SpiCookie.h
@@ -75,6 +75,12 @@ public:
      */
     void setCallbackMode(spi::send_callback_function_t callback, void* args);
 
+    /**
+	 * Can be used to set the callback arguments and a later point than initialization.
+	 * @param args
+	 */
+	void setCallbackArgs(void* args);
+
     /**
      * True if SPI transfers should be performed in full duplex mode
      * @return