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#include <assert.h>
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#include "gatt.h"
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#include "host/ble_hs.h"
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#include "app_log.h"
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static uint16_t ble_svc_gatt_changed_val_handle;
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static uint16_t ble_svc_gatt_start_handle;
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static uint16_t ble_svc_gatt_end_handle;
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static int ble_svc_gatt_access(uint16_t conn_handle, uint16_t attr_handle, struct ble_gatt_access_ctxt *ctxt, void *arg);
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static const struct ble_gatt_svc_def ble_svc_gatt_defs[] = {
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{
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/*** Service: GATT */
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.type = BLE_GATT_SVC_TYPE_PRIMARY,
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.uuid = BLE_UUID16_DECLARE(BLE_GATT_SVC_UUID16),
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.characteristics = (struct ble_gatt_chr_def[])
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{
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{
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.uuid = BLE_UUID16_DECLARE(BLE_SVC_GATT_CHR_SERVICE_CHANGED_UUID16),
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.access_cb = ble_svc_gatt_access,
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.val_handle = &ble_svc_gatt_changed_val_handle,
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.flags = BLE_GATT_CHR_F_INDICATE,
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},
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{
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0, /* No more characteristics in this service. */
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}
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},
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},
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{
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0, /* No more services. */
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},
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};
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static int ble_svc_gatt_access(uint16_t conn_handle, uint16_t attr_handle,
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struct ble_gatt_access_ctxt *ctxt, void *arg)
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{
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uint8_t *u8p;
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/* The only operation allowed for this characteristic is indicate. This
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* access callback gets called by the stack when it needs to read the
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* characteristic value to populate the outgoing indication command.
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* Therefore, this callback should only get called during an attempt to
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* read the characteristic.
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*/
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assert(ctxt->op == BLE_GATT_ACCESS_OP_READ_CHR);
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assert(ctxt->chr == &ble_svc_gatt_defs[0].characteristics[0]);
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u8p = os_mbuf_extend(ctxt->om, 4);
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if (u8p == NULL) {
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return BLE_HS_ENOMEM;
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}
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put_le16(u8p + 0, ble_svc_gatt_start_handle);
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put_le16(u8p + 2, ble_svc_gatt_end_handle);
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return 0;
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}
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/**
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* Indicates a change in attribute assignment to all subscribed peers.
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* Unconnected bonded peers receive an indication when they next connect.
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*
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* @param start_handle The start of the affected handle range.
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* @param end_handle The end of the affected handle range.
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*/
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void ble_svc_gatt_changed(uint16_t start_handle, uint16_t end_handle)
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{
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ble_svc_gatt_start_handle = start_handle;
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ble_svc_gatt_end_handle = end_handle;
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ble_gatts_chr_updated(ble_svc_gatt_changed_val_handle);
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}
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void ble_svc_gatt_init(void)
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{
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int rc;
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rc = ble_gatts_count_cfg(ble_svc_gatt_defs);
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app_assert(rc == 0);
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rc = ble_gatts_add_svcs(ble_svc_gatt_defs);
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app_assert(rc == 0);
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}
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