diff --git a/fake_lib/fakeethercat.cpp b/fake_lib/fakeethercat.cpp
index 6694f09d..2d6ed317 100644
--- a/fake_lib/fakeethercat.cpp
+++ b/fake_lib/fakeethercat.cpp
@@ -331,7 +331,7 @@ int ecrt_slave_config_complete_sdo(
     size_t size            /**< Size of the \a data. */
 )
 {
-    return -1;
+    return ecrt_slave_config_sdo(sc, index, 0, data, size);
 }
 ec_sdo_request_t *ecrt_slave_config_create_sdo_request(
     ec_slave_config_t *sc, /**< Slave configuration. */
@@ -437,6 +437,40 @@ int ecrt_slave_config_reg_pdo_entry(
     return -1; // offset
 }
 
+int ecrt_slave_config_sdo8(
+    ec_slave_config_t *sc, /**< Slave configuration */
+    uint16_t sdo_index,    /**< Index of the SDO to configure. */
+    uint8_t sdo_subindex,  /**< Subindex of the SDO to configure. */
+    uint8_t value          /**< Value to set. */
+)
+{
+    return ecrt_slave_config_sdo(sc, sdo_index, sdo_subindex, &value, 1);
+}
+
+int ecrt_slave_config_sdo16(
+    ec_slave_config_t *sc, /**< Slave configuration */
+    uint16_t sdo_index,    /**< Index of the SDO to configure. */
+    uint8_t sdo_subindex,  /**< Subindex of the SDO to configure. */
+    uint16_t const value   /**< Value to set. */
+)
+{
+    uint8_t buf[sizeof(value)];
+    memcpy(&buf, &value, sizeof(value));
+    return ecrt_slave_config_sdo(sc, sdo_index, sdo_subindex, buf, sizeof(buf));
+}
+
+int ecrt_slave_config_sdo32(
+    ec_slave_config_t *sc, /**< Slave configuration */
+    uint16_t sdo_index,    /**< Index of the SDO to configure. */
+    uint8_t sdo_subindex,  /**< Subindex of the SDO to configure. */
+    uint32_t const value   /**< Value to set. */
+)
+{
+    uint8_t buf[sizeof(value)];
+    memcpy(&buf, &value, sizeof(value));
+    return ecrt_slave_config_sdo(sc, sdo_index, sdo_subindex, buf, sizeof(buf));
+}
+
 int ecrt_slave_config_sdo(
     ec_slave_config_t *sc, /**< Slave configuration. */
     uint16_t index,        /**< Index of the SDO to configure. */
@@ -445,7 +479,8 @@ int ecrt_slave_config_sdo(
     size_t size            /**< Size of the \a data. */
 )
 {
-    return -1;
+    sc->sdos[sdo_address{index, subindex}] = std::basic_string<uint8_t>(data, data + size);
+    return 0;
 }
 
 void ecrt_write_lreal(void *data, double const value)
diff --git a/fake_lib/fakeethercat.h b/fake_lib/fakeethercat.h
index 1ae95045..2a26d5d8 100644
--- a/fake_lib/fakeethercat.h
+++ b/fake_lib/fakeethercat.h
@@ -30,6 +30,7 @@
 #include <list>
 #include <map>
 #include <memory>
+#include <string>
 #include <vector>
 
 struct Offset
@@ -89,12 +90,40 @@ public:
     }
 };
 
+
+class sdo_address
+{
+    uint32_t value;
+
+public:
+    sdo_address(uint16_t index, /**< Slave alias. */
+               uint8_t subindex /**< Slave position. */)
+        : value(static_cast<uint32_t>(index) << 8 | subindex)
+    {
+    }
+
+    uint16_t getIndex() const { return value >> 8; }
+    uint8_t getSubIndex() const { return value & 0xFF; }
+    uint32_t getCombined() const { return value; }
+
+    bool operator<(const sdo_address &other) const noexcept
+    {
+        return value < other.value;
+    }
+
+    bool operator==(const sdo_address &other) const noexcept
+    {
+        return value == other.value;
+    }
+};
+
 struct ec_slave_config
 {
     ec_address address;
     uint32_t vendor_id;    /**< Expected vendor ID. */
     uint32_t product_code; /**< Expected product code. */
     std::map<unsigned int, syncManager> sync_managers;
+    std::map<sdo_address, std::basic_string<uint8_t>> sdos;
 
     ec_slave_config(
         ec_address address,