ble2902.c

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#ifdef ESP32
#include <sdkconfig.h>
#if CONFIG_BT_BLE_ENABLED
 
#include "app.h"
#include "ble2902.h"
#include "logging.h"
#include "midi-private.h"
 
#include <string.h> // memcpy
 
void ble2902_handle_write(esp_gatt_if_t gatts_if,
                          esp_ble_gatts_cb_param_t *param) {
    // The actual writing of data and sending a response is already handled
    // by Bluedroid.
    uint16_t handle = param->write.handle;
    uint16_t value = ble2902_get_value(handle);
    if (value == 0x0001) {
        ESP_LOGI("MIDIBLE", "notify enable");
    } else if (value == 0x0002) {
        ESP_LOGI("MIDIBLE", "indicate enable");
    } else if (value == 0x0003) {
        ESP_LOGI("MIDIBLE", "notify & indicate enable");
    } else if (value == 0x0000) {
        ESP_LOGI("MIDIBLE", "notify/indicate disable ");
    } else {
        ESP_LOGE("MIDIBLE", "Unknown descriptor value %04x", value);
    }
    midi_ble_instance_handle_subscribe(
        param->write.conn_id, midi_get_characteristic_handle(), value & 0x0001);
}
 
uint16_t ble2902_get_value(uint16_t handle) {
    const uint8_t *data;
    uint16_t length;
    esp_ble_gatts_get_attr_value(handle, &length, &data);
    if (length != 2) {
        ESP_LOGE("MIDIBLE", "Unexpected descriptor value length (%d)", length);
        return 0;
    }
    uint16_t ret;
    memcpy(&ret, data, length);
    return ret;
}
 
#endif
#endif