diff --git a/TactilityC/Include/tt_hal_radio.h b/TactilityC/Include/tt_hal_radio.h
index 6f60c9ee..ed994c2a 100644
--- a/TactilityC/Include/tt_hal_radio.h
+++ b/TactilityC/Include/tt_hal_radio.h
@@ -70,8 +70,8 @@ struct RadioTxPacket {
 };
 
 typedef void (*RadioStateCallback)(DeviceId id, RadioState state, void* ctx);
-typedef void (*RadioTxStateCallback)(RadioTxId id, RadioTxState state);
-typedef void (*RadioOnReceiveCallback)(DeviceId id, const RadioRxPacket* packet);
+typedef void (*RadioTxStateCallback)(RadioTxId id, RadioTxState state, void* ctx);
+typedef void (*RadioOnReceiveCallback)(DeviceId id, const RadioRxPacket* packet, void* ctx);
 
 /**
  * Allocate a radio driver object for the specified radioId.
@@ -194,17 +194,19 @@ bool tt_hal_radio_stop(RadioHandle handle);
  * @param[in] handle the radio driver handle
  * @param[in] packet packet to send (no special requirement for memory of data)
  * @param[in] callback function to call on transmission state change for the packet
+ * @param[in] ctx context which will be passed to the callback function
  * @return the identifier for the transmission
  */
-RadioTxId tt_hal_radio_transmit(RadioHandle handle, RadioTxPacket packet, RadioTxStateCallback callback);
+RadioTxId tt_hal_radio_transmit(RadioHandle handle, RadioTxPacket packet, RadioTxStateCallback callback, void* ctx);
 
 /**
  * Subscribe for any received packet that the radio driver object receives.
  * @param[in] handle the radio driver handle
  * @param[in] callback function to call on reception of a packet
+ * @param[in] ctx context which will be passed to the callback function
  * @return the identifier for the subscription
  */
-RadioRxSubscriptionId tt_hal_radio_subscribe_receive(RadioHandle handle, RadioOnReceiveCallback callback);
+RadioRxSubscriptionId tt_hal_radio_subscribe_receive(RadioHandle handle, RadioOnReceiveCallback callback, void* ctx);
 
 /**
  * Subscribe for any state change of the radio driver object.
diff --git a/TactilityC/Source/tt_hal_radio.cpp b/TactilityC/Source/tt_hal_radio.cpp
index 8cf71208..e308b7fa 100644
--- a/TactilityC/Source/tt_hal_radio.cpp
+++ b/TactilityC/Source/tt_hal_radio.cpp
@@ -39,7 +39,10 @@ extern "C" {
 
     RadioHandle tt_hal_radio_alloc(DeviceId radioId) {
         auto radio = findValidRadioDevice(radioId);
-        return new DeviceWrapper(radio);
+        if (radio != nullptr) {
+            return new DeviceWrapper(radio);
+        }
+        return nullptr;
     }
 
     void tt_hal_radio_free(RadioHandle handle) {
@@ -116,15 +119,15 @@ extern "C" {
         return wrapper->device->stop();
     }
 
-    RadioTxId tt_hal_radio_transmit(RadioHandle handle, RadioTxPacket packet, RadioTxStateCallback callback) {
+    RadioTxId tt_hal_radio_transmit(RadioHandle handle, RadioTxPacket packet, RadioTxStateCallback callback, void* ctx) {
         auto wrapper = static_cast<DeviceWrapper*>(handle);
         auto ttPacket = tt::hal::radio::TxPacket{
             .data = std::vector<uint8_t>(packet.data, packet.data + packet.size),
             .address = packet.address
         };
-        return wrapper->device->transmit(ttPacket, [callback](tt::hal::radio::RadioDevice::TxId id, tt::hal::radio::RadioDevice::TransmissionState state) {
+        return wrapper->device->transmit(ttPacket, [callback, ctx](tt::hal::radio::RadioDevice::TxId id, tt::hal::radio::RadioDevice::TransmissionState state) {
             if (callback) {
-                callback(id, fromCpp(state));
+                callback(id, fromCpp(state), ctx);
             }
         });
     }
@@ -138,9 +141,9 @@ extern "C" {
         });
     }
 
-    RadioRxSubscriptionId tt_hal_radio_subscribe_receive(RadioHandle handle, RadioOnReceiveCallback callback) {
+    RadioRxSubscriptionId tt_hal_radio_subscribe_receive(RadioHandle handle, RadioOnReceiveCallback callback, void* ctx) {
         auto wrapper = static_cast<DeviceWrapper*>(handle);
-        return wrapper->device->subscribeRx([callback](tt::hal::Device::Id id, const tt::hal::radio::RxPacket& ttPacket) {
+        return wrapper->device->subscribeRx([callback, ctx](tt::hal::Device::Id id, const tt::hal::radio::RxPacket& ttPacket) {
             if (callback) {
                 auto ttcPacket = RadioRxPacket{
                     .data = ttPacket.data.data(),
@@ -148,7 +151,7 @@ extern "C" {
                     .rssi = ttPacket.rssi,
                     .snr = ttPacket.snr
                 };
-                callback(id, &ttcPacket);
+                callback(id, &ttcPacket, ctx);
             }
         });
     }
diff --git a/TactilityC/Source/tt_init.cpp b/TactilityC/Source/tt_init.cpp
index 649876d7..68f1c945 100644
--- a/TactilityC/Source/tt_init.cpp
+++ b/TactilityC/Source/tt_init.cpp
@@ -62,6 +62,8 @@ const esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(close),
     // time.h
     ESP_ELFSYM_EXPORT(clock_gettime),
+    ESP_ELFSYM_EXPORT(time),
+    ESP_ELFSYM_EXPORT(localtime),
     ESP_ELFSYM_EXPORT(strftime),
     // pthread
     ESP_ELFSYM_EXPORT(pthread_create),
@@ -387,7 +389,9 @@ const esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(lv_event_get_current_target_obj),
     // lv_color
     ESP_ELFSYM_EXPORT(lv_color_black),
+    ESP_ELFSYM_EXPORT(lv_color_darken),
     ESP_ELFSYM_EXPORT(lv_color_hex),
+    ESP_ELFSYM_EXPORT(lv_color_lighten),
     ESP_ELFSYM_EXPORT(lv_color_make),
     // lv_group
     ESP_ELFSYM_EXPORT(lv_group_add_obj),
@@ -413,6 +417,8 @@ const esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(lv_obj_get_display),
     ESP_ELFSYM_EXPORT(lv_obj_get_height),
     ESP_ELFSYM_EXPORT(lv_obj_get_parent),
+    ESP_ELFSYM_EXPORT(lv_obj_get_scroll_x),
+    ESP_ELFSYM_EXPORT(lv_obj_get_scroll_y),
     ESP_ELFSYM_EXPORT(lv_obj_get_style_grid_cell_column_pos),
     ESP_ELFSYM_EXPORT(lv_obj_get_style_grid_cell_column_span),
     ESP_ELFSYM_EXPORT(lv_obj_get_style_grid_cell_row_pos),
@@ -431,6 +437,8 @@ const esp_elfsym elf_symbols[] {
     ESP_ELFSYM_EXPORT(lv_obj_remove_event_cb),
     ESP_ELFSYM_EXPORT(lv_obj_remove_flag),
     ESP_ELFSYM_EXPORT(lv_obj_remove_state),
+    ESP_ELFSYM_EXPORT(lv_obj_scroll_to_x),
+    ESP_ELFSYM_EXPORT(lv_obj_scroll_to_y),
     ESP_ELFSYM_EXPORT(lv_obj_set_align),
     ESP_ELFSYM_EXPORT(lv_obj_set_flex_align),
     ESP_ELFSYM_EXPORT(lv_obj_set_flex_flow),