diff --git a/CMakeLists.txt b/CMakeLists.txt
index a49f6e5..876d098 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -18,27 +18,31 @@ find_package(GTest REQUIRED)
 find_package(cppcheck REQUIRED)
 find_package(magic_enum REQUIRED)
 
+if (CMAKE_SYSTEM_NAME MATCHES "Windows" OR CMAKE_SYSTEM_NAME MATCHES "Linux" AND NOT BUILD_SHARED_LIBS)
+    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-allow-multiple-definition")
+endif()
 if (CMAKE_SYSTEM_NAME MATCHES "Windows")
     set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static")
-    set(CMAKE_EXE_LINKER_FLAGS "${CMAKE_EXE_LINKER_FLAGS} -Wl,-allow-multiple-definition")
     set(CMAKE_CROSSCOMPILING_EMULATOR "wine")
 endif()
 
 set(CMAKE_LIBRARY_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
+set(CMAKE_ARCHIVE_OUTPUT_DIRECTORY ${CMAKE_BINARY_DIR}/lib)
 add_library(${LIBRARY_NAME})
 
 add_subdirectory(source)
 #add_subdirectory(test)
 
-option(BUILD_EXAMPLES "Build examples" ON)
+option(BUILD_EXAMPLES "Build examples" OFF)
+if(BUILD_EXAMPLES)
     add_subdirectory(examples)
+endif()
 
 target_include_directories(${LIBRARY_NAME} PUBLIC
     ${CMAKE_CURRENT_LIST_DIR}
     ${CMAKE_BINARY_DIR}
 )
 
-
 target_link_libraries(${LIBRARY_NAME}
   $<$<OR:$<NOT:$<BOOL:${BUILD_SHARED_LIBS}>>,$<STREQUAL:${CMAKE_SYSTEM_NAME},Windows>>:PahoMqttCpp::paho-mqttpp3-static>
   $<$<AND:$<BOOL:${BUILD_SHARED_LIBS}>,$<NOT:$<STREQUAL:${CMAKE_SYSTEM_NAME},Windows>>>:PahoMqttCpp::paho-mqttpp3>
@@ -47,8 +51,7 @@ target_link_libraries(${LIBRARY_NAME}
   magic_enum::magic_enum
 )
 
-
 set_target_properties(${LIBRARY_NAME} PROPERTIES
     VERSION ${PROJECT_VERSION}
     SOVERSION ${PROJECT_VERSION_MAJOR}
-)
\ No newline at end of file
+)
diff --git a/conanfile.py b/conanfile.py
index 3e51033..4932759 100644
--- a/conanfile.py
+++ b/conanfile.py
@@ -12,7 +12,7 @@ class PzaCxx(ConanFile):
     }
     default_options = {
         "shared": True,
-        "build_examples": True
+        "build_examples": False
     }
     generators = "CMakeDeps", "CMakeToolchain", "virtualrunenv"
     exports_sources = "CMakeLists.txt", "source/*", "version.h.in", "CHANGELOG.md", "test/*", "cmake/*", "examples/*", "LICENSE"
diff --git a/examples/bps.cxx b/examples/bps.cxx
index 4135c70..ff1b6b2 100644
--- a/examples/bps.cxx
+++ b/examples/bps.cxx
@@ -4,7 +4,7 @@
 
 int main(void)
 {
-    pza::core::set_log_level(pza::core::log_level::debug);
+    pza::core::set_log_level(pza::core::log_level::trace);
 
     pza::client::ptr cli = std::make_shared<pza::client>("localhost", 1883);
 
@@ -17,38 +17,26 @@ int main(void)
     if (cli->register_device(bps) == -1)
         return -1;
 
-    for (size_t i = 0; i < bps->get_num_channels(); i++) {
+    for (size_t i = 0; i < 1; i++) {
         auto bps_channel = bps->channel[i];
 
-        auto mdr = [&](double value) {
-            spdlog::info("Voltage: {}", value);
-        };
-
-        bps_channel->voltmeter.add_measure_callback(mdr);
-
-        bps_channel->voltmeter.remove_measure_callback(mdr);
-
-        auto lol = [&](double value) {
-            spdlog::info("double: {}", value);
-        };
-
-        bps_channel->voltmeter.add_measure_callback(lol);
-
-        bps_channel->voltmeter.remove_measure_callback(lol);
-
-        spdlog::info("Channel {}:", i);
-        bps_channel->ctrl.set_voltage(-7.3);
-        bps_channel->ctrl.set_current(1.0);
-        bps_channel->ctrl.set_enable(false);
-        spdlog::info("  Voltage: {}", bps_channel->voltmeter.get_measure());
-        spdlog::info("  Current: {}", bps_channel->ampermeter.get_measure());
-        spdlog::info("  Enabled: {}", bps_channel->ctrl.get_enable());
-        bps_channel->ctrl.set_enable(true);
-        bps_channel->ctrl.set_voltage(3.3);
-        bps_channel->ctrl.set_current(5.0);
-        spdlog::info("  Voltage: {}", bps_channel->voltmeter.get_measure());
-        spdlog::info("  Current: {}", bps_channel->ampermeter.get_measure());
-        spdlog::info("  Enabled: {}", bps_channel->ctrl.get_enable());
+//        spdlog::info("Channel {}:", i);
+//        bps_channel->ctrl.set_voltage(-7.3);
+//        bps_channel->ctrl.set_current(1.0);
+//        bps_channel->ctrl.set_enable(false);
+//        spdlog::info("  Voltage: {}", bps_channel->voltmeter.get_measure());
+//        spdlog::info("  Current: {}", bps_channel->ampermeter.get_measure());
+//        spdlog::info("  Enabled: {}", bps_channel->ctrl.get_enable());
+//        bps_channel->ctrl.set_enable(true);
+//        bps_channel->ctrl.set_voltage(3.3);
+//        bps_channel->ctrl.set_current(5.0);
+//        spdlog::info("  Voltage: {}", bps_channel->voltmeter.get_measure());
+//        spdlog::info("  Current: {}", bps_channel->ampermeter.get_measure());
+//        spdlog::info("  Enabled: {}", bps_channel->ctrl.get_enable());
+
+        //bps_channel->voltmeter.set_measure_polling_cycle(2);
+        //bps_channel->ampermeter.set_measure_polling_cycle(2);
+        bps_channel->ctrl.set_enable_polling_cycle(2);
     }
 
     spdlog::info("\n\nOK\n\n");
diff --git a/scripts/build.sh b/scripts/build.sh
index 5777cd8..64d2cf1 100755
--- a/scripts/build.sh
+++ b/scripts/build.sh
@@ -3,6 +3,7 @@
 BUILD_DIR_LINUX="build"
 BUILD_DIR_WINDOWS="buildwin"
 BUILD_TYPE="Debug"
+BUILD_EXAMPLES="False"
 SHARED="True"
 TARGET="Linux"
 BUILD_DIR=$BUILD_DIR_LINUX
@@ -23,7 +24,7 @@ function install_deps {
 	fi
 	mkdir -p $BUILD_DIR
 	cd $BUILD_DIR
-	conan install .. -o shared=$SHARED -s build_type=$BUILD_TYPE --build=missing -pr:b ../conan_profiles/x86_64_Linux $EXTRA_CONAN_ARGS
+	conan install .. -o shared=$SHARED -o build_examples=$BUILD_EXAMPLES -s build_type=$BUILD_TYPE --build=missing -pr:b ../conan_profiles/x86_64_Linux $EXTRA_CONAN_ARGS
 }
 
 function build {
@@ -39,17 +40,18 @@ function clean {
 }
 
 function usage {
-	echo "Usage: $0 [-t <target>] [-r] [-s] [-d] [-c] [-h]"
+	echo "Usage: $0 [-t <target>] [-r] [-s] [-d] [-e] [-c] [-h]"
 	echo "  -t  Target platform (Windows or Linux). Default is Linux"
 	echo "  -r  Build in Release mode. Default is Debug"
 	echo "  -s  Build in Static mode. Default is Shared"
 	echo "  -d  Install dependencies"
+	echo "  -e  Build examples"
 	echo "  -c  Clean build directory"
 	echo "  -h  Display this help message"
 }
 
 # Parse command line arguments
-while getopts "t:rscdbh" opt; do
+while getopts "t:rscdebh" opt; do
 	case $opt in
 		t)
 			TARGET=$OPTARG
@@ -71,6 +73,9 @@ while getopts "t:rscdbh" opt; do
 		d)
 			DEPS="True"
 			;;
+		e)
+			BUILD_EXAMPLES="True"
+			;;
 		h)
 			usage
 			exit 0
diff --git a/source/pza/core/attribute.hxx b/source/pza/core/attribute.hxx
index 4dfc2a2..142852c 100644
--- a/source/pza/core/attribute.hxx
+++ b/source/pza/core/attribute.hxx
@@ -18,13 +18,16 @@ namespace pza
 
         explicit attribute(const std::string &name);
 
-        template<typename T>
-        void add_field(const std::string &name, bool readonly)
+        template <typename T>
+        void add_ro_field(const std::string &name)
         {
-            field<T> field(name, readonly);
+            add_field<T>(name, access_mode::readonly);
+        }
 
-            field._callback = std::bind(&attribute::data_from_field, this, std::placeholders::_1);
-            _fields[name] = field;
+        template <typename T>
+        void add_rw_field(const std::string &name)
+        {
+            add_field<T>(name, access_mode::readwrite);
         }
 
         void on_message(const mqtt::const_message_ptr &message);
@@ -44,6 +47,15 @@ namespace pza
 
         int data_from_field(const nlohmann::json &data);
 
+        template<typename T>
+        void add_field(const std::string &name, access_mode mode)
+        {
+            field<T> field(name, mode);
+
+            field._callback = std::bind(&attribute::data_from_field, this, std::placeholders::_1);
+            _fields[name] = field;
+        }
+
         template<typename T>
         void _assign_value(std::any &elem, const nlohmann::json &data)
         {
diff --git a/source/pza/core/client.cxx b/source/pza/core/client.cxx
index 2e7da91..4095c79 100644
--- a/source/pza/core/client.cxx
+++ b/source/pza/core/client.cxx
@@ -28,7 +28,7 @@ int client::connect(void)
 {
     int ret;
 
-    spdlog::trace("connecting to {}...", _addr);
+    spdlog::debug("Attempting connection to {}...", _addr);
 
     mqtt::connect_options connOpts;
 
@@ -55,7 +55,7 @@ int client::connect(void)
 
 int client::disconnect(void)
 {
-    spdlog::trace("disconnecting from {}...", _addr);
+    spdlog::debug("Attempting to disconnect from {}...", _addr);
 
     try {
         _paho_client->disconnect()->wait_for(std::chrono::seconds(CONN_TIMEOUT));
@@ -117,7 +117,6 @@ bool client::_topic_matches(const std::string &str, const std::string &fnmatchPa
     return std::regex_match(str, pattern);
 }
 
-
 int client::_subscribe(const std::string &topic, const std::function<void(mqtt::const_message_ptr)> &cb)
 {
     std::string t;
@@ -135,7 +134,6 @@ int client::_subscribe(const std::string &topic, const std::function<void(mqtt::
     }
 
     spdlog::trace("subscribed to topic: {}", topic);
-
     return 0;
 }
 
@@ -226,7 +224,7 @@ int client::scan_devices(void)
 
     if (ret == false) {
         spdlog::error("timed out waiting for scan results");
-        spdlog::debug("_scan_device_count_expected = {}, got = {}", _scan_device_count_expected, _scan_device_results.size());
+        spdlog::debug("Expected {} devices, got {}", _scan_device_count_expected, _scan_device_results.size());
         return -1;
     }
 
@@ -249,7 +247,7 @@ int client::_scan_interfaces(std::unique_lock<std::mutex> &lock, const device::p
     const std::string &scan_payload = _scan_device_results[device->_get_base_topic()];
 
     if (json::get_unsigned_int(scan_payload, "info", "number_of_interfaces", _scan_itf_count_expected) == -1) {
-        spdlog::error("Unknown number of interface for device");
+        spdlog::error("Unknown number of interfaces for device {}", device->_get_base_topic());
         return -1;
     }
 
diff --git a/source/pza/core/device.cxx b/source/pza/core/device.cxx
index cd8bc1c..0ec8b7c 100644
--- a/source/pza/core/device.cxx
+++ b/source/pza/core/device.cxx
@@ -38,6 +38,9 @@ int device::_set_identity(const std::string &payload)
         return -1;
     }
 
+    // Convert to lowercase
+    std::transform(family.begin(), family.end(), family.begin(), ::tolower);
+
     if (family != get_family()) {
         spdlog::error("Device is not compatible {} != {}", family, get_family());
         return -1;
diff --git a/source/pza/core/field.hxx b/source/pza/core/field.hxx
index 9e27769..c2538a9 100644
--- a/source/pza/core/field.hxx
+++ b/source/pza/core/field.hxx
@@ -8,15 +8,22 @@
 
 namespace pza
 {
+    enum class access_mode
+    {
+        readonly,
+        readwrite
+    };
+
     template <typename _type>
     class field
     {
     public:
         friend class attribute;
 
-        explicit field(const std::string &name, bool readonly)
-            : _name(name),
-            _readonly(readonly)
+        explicit field(const std::string &name, access_mode mode = access_mode::readonly)
+            : _value(_type()),
+            _name(name),
+            _mode(mode)
         {
             _setJsonType();
         }
@@ -48,17 +55,17 @@ namespace pza
 
         bool is_readonly(void) const
         {
-            return _readonly;
+            return (_mode == access_mode::readonly);
         }
 
         using get_callback_type = std::function<void(_type)>;
 
-        void add_get_callback(const get_callback_type& callback)
+        void add_get_callback(const get_callback_type &callback)
         {
             _get_callbacks.push_back(std::make_shared<get_callback_type>(callback));
         }
 
-        void remove_get_callback(const get_callback_type& callback)
+        void remove_get_callback(const get_callback_type &callback)
         {
             _get_callbacks.remove_if([&](const std::shared_ptr<get_callback_type>& ptr) {
                 return callback.target_type() == ptr->target_type();
@@ -107,11 +114,11 @@ namespace pza
             }
         }
 
-        _type _value = _type();
+        _type _value;
         std::string _name;
         nlohmann::json::value_t _json_type;
         std::list<std::shared_ptr<get_callback_type>> _get_callbacks;
-        bool _readonly;
+        access_mode _mode;
         std::function<int(const nlohmann::json &data)> _callback;
     };
 };
\ No newline at end of file
diff --git a/source/pza/core/united_interface.hxx b/source/pza/core/grouped_interface.hxx
similarity index 63%
rename from source/pza/core/united_interface.hxx
rename to source/pza/core/grouped_interface.hxx
index 3e86ce6..df36b8f 100644
--- a/source/pza/core/united_interface.hxx
+++ b/source/pza/core/grouped_interface.hxx
@@ -11,22 +11,22 @@ namespace pza
 {
     class device;
 
-    class united_interface
+    class grouped_interface
     {
     public:
-        using ptr = std::shared_ptr<united_interface>;
+        using ptr = std::shared_ptr<grouped_interface>;
 
-        united_interface() = delete;
-        united_interface(const united_interface&) = delete;
-        united_interface(united_interface&&) = delete;
-        ~united_interface() = delete;
+        grouped_interface() = delete;
+        grouped_interface(const grouped_interface&) = delete;
+        grouped_interface(grouped_interface&&) = delete;
+        ~grouped_interface() = delete;
 
         template <typename T>
         static int register_interfaces(device *device, const std::string &name, const std::map<std::string, std::string> &map, std::vector<std::shared_ptr<T>> &channels)
         {
             int ret = 0;
-            size_t pos;
-            size_t chan_id;
+            size_t pos = 0;
+            int chan_id = -1;
 
             for (auto const &elem : map) {
                 if (pza::string::starts_with(elem.first, ":" + name + "_") == true) {
@@ -35,8 +35,13 @@ namespace pza
                 }
             }
 
+            if (chan_id == -1) {
+                spdlog::error("No {} channels found", name);
+                return -1;
+            }
+
             channels.reserve(chan_id + 1);
-            for (size_t i = 0; i < chan_id + 1; i++) {
+            for (int i = 0; i < chan_id + 1; i++) {
                 channels.push_back(std::make_shared<T>(device, ":" + name + "_" + std::to_string(i) + ":"));
             }
 
diff --git a/source/pza/devices/bps.cxx b/source/pza/devices/bps.cxx
index d9494aa..e7bcdfb 100644
--- a/source/pza/devices/bps.cxx
+++ b/source/pza/devices/bps.cxx
@@ -20,7 +20,7 @@ int bps::_register_interfaces(const std::map<std::string, std::string> &map)
 {
 	int ret;
 	
-	ret = united_interface::register_interfaces<bps_channel>(this, "channel", map, channel);
+	ret = grouped_interface::register_interfaces<bps_channel>(this, "channel", map, channel);
 	if (ret < 0)
 		return ret;
 
diff --git a/source/pza/devices/bps.hxx b/source/pza/devices/bps.hxx
index 461ad80..b108084 100644
--- a/source/pza/devices/bps.hxx
+++ b/source/pza/devices/bps.hxx
@@ -1,7 +1,7 @@
 #pragma once
 
 #include <pza/core/device.hxx>
-#include <pza/core/united_interface.hxx>
+#include <pza/core/grouped_interface.hxx>
 
 #include <pza/interfaces/meter.hxx>
 #include <pza/interfaces/bps_chan_ctrl.hxx>
diff --git a/source/pza/interfaces/bps_chan_ctrl.cxx b/source/pza/interfaces/bps_chan_ctrl.cxx
index 1965d59..d28737a 100644
--- a/source/pza/interfaces/bps_chan_ctrl.cxx
+++ b/source/pza/interfaces/bps_chan_ctrl.cxx
@@ -10,17 +10,18 @@ bps_chan_ctrl::bps_chan_ctrl(device *device, const std::string &name)
     _amps("amps"),
     _enable("enable")
 {
-    _volts.add_field<double>("goal", false);
-    _volts.add_field<double>("min", true);
-    _volts.add_field<double>("max", true);
-    _volts.add_field<int>("decimals", true);
+    _volts.add_rw_field<double>("goal");
+    _volts.add_ro_field<double>("min");
+    _volts.add_ro_field<double>("max");
+    _volts.add_ro_field<int>("decimals");
 
-    _amps.add_field<double>("goal", false);
-    _amps.add_field<double>("min", true);
-    _amps.add_field<double>("max", true);
-    _amps.add_field<int>("decimals", true);
+    _amps.add_rw_field<double>("goal");
+    _amps.add_ro_field<double>("min");
+    _amps.add_ro_field<double>("max");
+    _amps.add_ro_field<int>("decimals");
 
-    _enable.add_field<bool>("value", false);
+    _enable.add_rw_field<bool>("value");
+    _enable.add_rw_field<int>("polling_cycle");
     
     register_attributes({&_volts, &_amps, &_enable});
 }
@@ -61,6 +62,11 @@ bool bps_chan_ctrl::get_enable()
     return _enable.get_field<bool>("value").get();
 }
 
+int bps_chan_ctrl::set_enable_polling_cycle(double seconds)
+{
+    return _enable.get_field<int>("polling_cycle").set(seconds);
+}
+
 void bps_chan_ctrl::add_enable_callback(const std::function<void(bool)> &callback)
 {
     _enable.get_field<bool>("value").add_get_callback(callback);
diff --git a/source/pza/interfaces/bps_chan_ctrl.hxx b/source/pza/interfaces/bps_chan_ctrl.hxx
index 5c6e272..3ae6f7c 100644
--- a/source/pza/interfaces/bps_chan_ctrl.hxx
+++ b/source/pza/interfaces/bps_chan_ctrl.hxx
@@ -21,6 +21,7 @@ namespace pza
         int set_voltage(double volts);
         int set_current(double amps);
         int set_enable(bool enable);
+        int set_enable_polling_cycle(double seconds);
         bool get_enable();
 
         void add_enable_callback(const std::function<void(bool)> &callback);
diff --git a/source/pza/interfaces/meter.cxx b/source/pza/interfaces/meter.cxx
index 3114f3f..cb25e3c 100644
--- a/source/pza/interfaces/meter.cxx
+++ b/source/pza/interfaces/meter.cxx
@@ -6,7 +6,9 @@ meter::meter(device *device, const std::string &name)
     : interface(device, name),
     _measure("measure")
 {
-    _measure.add_field<double>("value", true);
+    _measure.add_ro_field<double>("value");
+    _measure.add_ro_field<double>("polling_cycle");
+    
 
     register_attributes({&_measure});
 }
@@ -16,6 +18,11 @@ double meter::get_measure()
     return _measure.get_field<double>("value").get();
 }
 
+int meter::set_measure_polling_cycle(double seconds)
+{
+    return _measure.get_field<double>("polling_cycle").set(seconds);
+}
+
 void meter::add_measure_callback(const std::function<void(double)> &callback)
 {
     _measure.get_field<double>("value").add_get_callback(callback);
diff --git a/source/pza/interfaces/meter.hxx b/source/pza/interfaces/meter.hxx
index 38244d3..07894b4 100644
--- a/source/pza/interfaces/meter.hxx
+++ b/source/pza/interfaces/meter.hxx
@@ -9,6 +9,7 @@ namespace pza {
         meter(device *device, const std::string &name);
 
         double get_measure();
+        int set_measure_polling_cycle(double seconds);
 
         void add_measure_callback(const std::function<void(double)> &callback);
         void remove_measure_callback(const std::function<void(double)> &callback);