c - How do callback methods for GATT services in bluez look like? -


when adding gatt service using bluez (using 'gatt_service_add()') can specify various callback methods attrib_read, attrib_write, etc. there example 'reading' characteristics given:

static uint8_t battery_state_read(struct attribute *a,  struct btd_device *device, gpointer user_data);

how methods other features (eg: write)?

i've been working bluez 4.101 bringing gatt server, you'll want take @ "linkloss.c" located (in bluez 4.101 @ least) in "proximity" directory. or here guess: https://github.com/pauloborges/bluez/blob/master/profiles/proximity/linkloss.c

the link loss service registered writable callbacks like:

svc_added = gatt_service_add(adapter,         gatt_prim_svc_uuid, &uuid,         /* alert level characteristic */         gatt_opt_chr_uuid16, alert_level_chr_uuid,         gatt_opt_chr_props,             att_char_proper_read | att_char_proper_write,         gatt_opt_chr_value_cb, attrib_read,             link_loss_alert_lvl_read, lladapter,         gatt_opt_chr_value_cb, attrib_write,             link_loss_alert_lvl_write, lladapter,         gatt_opt_chr_value_get_handle,             &lladapter->alert_lvl_value_handle,         gatt_opt_invalid);

where callback structure like:

static uint8_t link_loss_alert_lvl_write(struct attribute *a, struct btd_device *device, gpointer user_data) {  /*stuff*/ }

the "attribute" struct contains data passed writable callback.


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