diff --git a/include/barback.h b/include/barback.h
new file mode 100644
index 0000000..d245583
--- /dev/null
+++ b/include/barback.h
@@ -0,0 +1,14 @@
+#ifndef __BARBACK_H__
+#define __BARBACK_H__
+
+typedef uint8_t (*barback_ble_access_read_t)(uint8_t idx);
+typedef uint8_t (*barback_ble_access_write_t)(uint8_t idx, uint8_t value);
+
+typedef struct {
+  uint16_t base_uuid;
+
+  barback_ble_access_read_t read;
+  barback_ble_access_write_t write;
+} barback_ble_access_t;
+
+#endif
diff --git a/include/pumps.h b/include/pumps.h
index 63c6b83..6786624 100644
--- a/include/pumps.h
+++ b/include/pumps.h
@@ -13,8 +13,8 @@ void pumps_run();
 void pumps_stop();
 uint8_t pumps_init();
 
-uint8_t pumps_set_time(uint8_t idx, uint8_t time);
-uint8_t pumps_get_time(uint8_t idx);
+uint8_t pumps_set_duration(uint8_t idx, uint8_t time);
+uint8_t pumps_get_duration(uint8_t idx);
 
 uint8_t pumps_set_enabled(uint8_t idx, uint8_t value);
 uint8_t pumps_get_enabled(uint8_t idx);
diff --git a/main/ble.c b/main/ble.c
index 6cb2f7d..b079241 100644
--- a/main/ble.c
+++ b/main/ble.c
@@ -15,6 +15,7 @@
 #include "services/bas/ble_svc_bas.h"
 #include "driver/gpio.h"
 
+#include "barback.h"
 #include "main.h"
 #include "ble.h"
 #include "pumps.h"
@@ -44,10 +45,8 @@ static event_callback_handle_t callback_handlers[CONFIG_CACO_MAX_SERVICES] = { 0
 
 static int ble_gap_event(struct ble_gap_event *event, void *arg);
 static int ble_svc_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
-static int svc_access_pump_state(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
-static int svc_access_pump_enabled(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
-static int svc_access_pump_duration(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
-static int svc_access_system(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
+
+static int barback_ble_char_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
 
 #define BLE_SERVICE_PUMP_ENABLED        (0x4200)
 #define BLE_SERVICE_PUMP_STATE          (0x4300)
@@ -57,23 +56,40 @@ static int svc_access_system(uint16_t conn_handle, uint16_t attr_handle, struct
 #define CHAR_POUR                       (BLE_SERVICE_BARBACK + 1)
 #define CHAR_BUTTON                     (BLE_SERVICE_BARBACK + 2)
 
+static barback_ble_access_t barback_ble_pump_access_enabled = {
+  .read = pumps_get_enabled,
+  .write = pumps_set_enabled
+};
+
 #define BLE_CHAR_PUMP_ENABLED(idx) {\
   .uuid = BLE_UUID16_DECLARE(BLE_SERVICE_PUMP_ENABLED + idx),\
-  .access_cb = svc_access_pump_enabled,\
+  .access_cb = barback_ble_char_access,\
+  .arg = &barback_ble_pump_access_enabled,\
   .val_handle = &ble_svc_handle,\
   .flags = BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_READ\
 }
 
+static barback_ble_access_t barback_ble_pump_access_state = {
+  .read = pumps_get_state,
+};
+
 #define BLE_CHAR_PUMP_STATE(idx) {\
   .uuid = BLE_UUID16_DECLARE(BLE_SERVICE_PUMP_STATE + idx),\
-  .access_cb = svc_access_pump_state,\
+  .access_cb = barback_ble_char_access,\
+  .arg = &barback_ble_pump_access_state,\
   .val_handle = &ble_svc_handle,\
   .flags = BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_READ\
 }
 
+static barback_ble_access_t barback_ble_pump_access_duration = {
+  .read = pumps_get_duration,
+  .write = pumps_set_duration
+};
+
 #define BLE_CHAR_PUMP_DURATION(idx) {\
   .uuid = BLE_UUID16_DECLARE(BLE_SERVICE_PUMP_DURATION + idx),\
-  .access_cb = svc_access_pump_duration,\
+  .access_cb = barback_ble_char_access,\
+  .arg = &barback_ble_pump_access_duration,\
   .val_handle = &pump_duration_svc_val_handles[idx - 1],\
   .flags = BLE_GATT_CHR_F_WRITE | BLE_GATT_CHR_F_NOTIFY | BLE_GATT_CHR_F_READ\
 }
@@ -182,14 +198,15 @@ static int svc_access_system(uint16_t conn_handle, uint16_t attr_handle, struct
   return 0;
 }
 
-static int svc_access_pump_enabled(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
+static int barback_ble_char_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
   uint16_t uuid16 = ble_uuid_u16(ctxt->chr->uuid);
   uint8_t idx = uuid16 - (BLE_SERVICE_PUMP_ENABLED + 1);
   uint8_t value = 0;
 
+  barback_ble_access_t *access = (barback_ble_access_t *)arg;
+
   ESP_LOGI(TAG, "conn_handle: %d	attr_handle: %d	char: 0x%02X	op: %s", conn_handle, attr_handle, uuid16, (ctxt->op == 0 ? "read" : ctxt->op == 1 ? "write" : "unknown"));
 
-
   if(ctxt->op == BLE_GATT_ACCESS_OP_WRITE_CHR) {
     gatt_svr_chr_write(
         ctxt->om,
@@ -206,9 +223,15 @@ static int svc_access_pump_enabled(uint16_t conn_handle, uint16_t attr_handle, s
       }
     }
 
-    pumps_set_enabled(idx, value);
+    if(access->write != NULL)
+      access->write(idx, value);
   } else if(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR) {
-    uint8_t enabled = pumps_get_enabled(idx);
+    if(access->read != NULL) {
+      ESP_LOGW(TAG, "Attempted read without defining access.read");
+      return 1;
+    }
+
+    uint8_t enabled = access->read(idx);
 
     ESP_LOGI(TAG, "pumps_enabled[%d] = %d", idx, enabled);
     os_mbuf_append(ctxt->om, &enabled, sizeof enabled);
@@ -217,60 +240,6 @@ static int svc_access_pump_enabled(uint16_t conn_handle, uint16_t attr_handle, s
   return 0;
 }
 
-static int svc_access_pump_duration(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
-  uint16_t uuid16 = ble_uuid_u16(ctxt->chr->uuid);
-  uint8_t idx = uuid16 - (BLE_SERVICE_PUMP_DURATION + 1);
-  uint8_t value = 0;
-
-  ESP_LOGI(TAG, "pump_duration: conn_handle: %d	attr_handle: %d	char: 0x%02X	op: %s", conn_handle, attr_handle, uuid16, (ctxt->op == 0 ? "read" : ctxt->op == 1 ? "write" : "unknown"));
-
-  if(ctxt->op == BLE_GATT_ACCESS_OP_WRITE_CHR) {
-    gatt_svr_chr_write(
-        ctxt->om,
-        sizeof value,
-        sizeof value,
-        &value, NULL
-        );
-
-    struct ble_gap_conn_desc notifiee;
-
-    for (uint16_t i = 0; i < CONFIG_NIMBLE_MAX_CONNECTIONS; i++) {
-      if(ble_gap_conn_find(i, &notifiee) == ESP_OK) {
-        ble_gattc_notify_custom(i, attr_handle, ctxt->om);
-      }
-    }
-
-    pumps_set_time(idx, value);
-  } else if(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR) {
-    uint8_t duration = pumps_get_time(idx);
-
-    ESP_LOGI(TAG, "pumps_duration[%d] = %d", idx, duration);
-    os_mbuf_append(ctxt->om, &duration, sizeof duration);
-  }
-
-  return 0;
-}
-
-static int svc_access_pump_state(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg) {
-  uint16_t uuid16 = ble_uuid_u16(ctxt->chr->uuid);
-  uint8_t idx = uuid16 - (BLE_SERVICE_PUMP_ENABLED + 1);
-
-  ESP_LOGI(TAG, "pump_state: conn_handle: %d	attr_handle: %d	char: 0x%02X	op: %s", conn_handle, attr_handle, uuid16, (ctxt->op == 0 ? "read" : ctxt->op == 1 ? "write" : "unknown"));
-
-  if(ctxt->op == BLE_GATT_ACCESS_OP_WRITE_CHR) {
-    ESP_LOGW(TAG, "attempting non-read op on read only characteristics");
-
-    return 1;
-  } else if(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR) {
-    uint8_t state = pumps_get_state(idx);
-
-    ESP_LOGI(TAG, "pumps_state[%d] = %d", idx, state);
-    os_mbuf_append(ctxt->om, &state, sizeof state);
-  }
-
-  return 0;
-}
-
 static void ble_advertise(void) {
   // check if already adverting
   if(ble_gap_adv_active()) return;
diff --git a/main/pumps.c b/main/pumps.c
index 650d082..ade3045 100644
--- a/main/pumps.c
+++ b/main/pumps.c
@@ -17,7 +17,7 @@ static uint8_t pumps_enabled[PUMPS] = {0};
 static uint8_t pumps_state[PUMPS] = {0};
 static uint8_t safety = 1;
 
-uint8_t pumps_set_time(uint8_t idx, uint8_t time) {
+uint8_t pumps_set_duration(uint8_t idx, uint8_t time) {
   if(idx > PUMPS) return PUMPS_ERR_OUT_IDX;
 
   ESP_LOGI(TAG, "duration update: %d = %d", idx, time);
@@ -44,7 +44,7 @@ uint8_t pumps_get_enabled(uint8_t idx) {
   return pumps_enabled[idx] ? 1 : 0;
 }
 
-uint8_t pumps_get_time(uint8_t idx) {
+uint8_t pumps_get_duration(uint8_t idx) {
   return pumps_duration[idx];
 }