This simple node type exports a node with only a input port that
receives pulses that will be exported via the Heartrate service as beats
per minute.
---
peripheral/soletta/heartrate-genspec.json | 31 ++++
peripheral/soletta/heartrate.c | 270 ++++++++++++++++++++++++++++++
2 files changed, 301 insertions(+)
create mode 100644 peripheral/soletta/heartrate-genspec.json
create mode 100644 peripheral/soletta/heartrate.c
diff --git a/peripheral/soletta/heartrate-genspec.json b/peripheral/soletta/heartrate-genspec.json
new file mode 100644
index 0000000..2b9c90a
--- /dev/null
+++ b/peripheral/soletta/heartrate-genspec.json
@@ -0,0 +1,31 @@
+{
+ "$schema": "http://solettaproject.github.io/soletta/schemas/node-type-genspec.schema";,
+ "name": "Bluetooth",
+ "meta": {
+ "author": "Intel Corporation",
+ "version": "1"
+ },
+ "types": [
+ {
+ "category": "output/hw",
+ "description": "Bluetooth Smart Heart Rate Profile server",
+ "in_ports": [
+ {
+ "data_type": "any",
+ "description": "each packet is a beat",
+ "methods": {
+ "process": "heartrate_in_process"
+ },
+ "name": "IN"
+ }
+ ],
+ "methods": {
+ "close": "heartrate_close",
+ "open": "heartrate_open"
+ },
+ "name": "heartrate",
+ "private_data_type": "heartrate_data",
+ "url": "http://soletta.org/doc/latest/node_types/heartrate.html";
+ }
+ ]
+}
diff --git a/peripheral/soletta/heartrate.c b/peripheral/soletta/heartrate.c
new file mode 100644
index 0000000..4f6fbfa
--- /dev/null
+++ b/peripheral/soletta/heartrate.c
@@ -0,0 +1,270 @@
+#include "heartrate-gen.h"
+
+#include <errno.h>
+#include <stdio.h>
+#include <bluetooth.h>
+#include <l2cap.h>
+
+#include <uuid.h>
+
+#include "src/shared/queue.h"
+#include "src/shared/att.h"
+#include "src/shared/gatt-db.h"
+#include "src/shared/timeout.h"
+#include "src/shared/util.h"
+
+#include "peripheral/gap.h"
+#include "peripheral/gatt.h"
+
+#include <sol-flow.h>
+#include <sol-log.h>
+
+/* In seconds */
+#define WINDOW_SIZE 5
+
+struct heartrate_data {
+ struct gatt_db_attribute *service;
+ struct queue *to_notify;
+ int notifier;
+ int beats_per_window;
+ unsigned int disconnect_watch;
+ uint16_t handle;
+};
+
+static struct queue *sensors;
+
+static struct gatt_db *gatt_db;
+
+static int heartrate_in_process(struct sol_flow_node *node, void *data,
+ uint16_t port, uint16_t conn_id,
+ const struct sol_flow_packet *packet)
+{
+ struct heartrate_data *hr = data;
+
+ if (queue_isempty(hr->to_notify))
+ return 0;
+
+ hr->beats_per_window++;
+
+ return 0;
+}
+
+static bool bluetooth_init(void)
+{
+ gap_start();
+
+ sensors = queue_new();
+ if (!sensors)
+ return false;
+
+ return true;
+}
+
+static bool match_att(const void *data, const void *match_data) {
+ return data == match_data;
+}
+
+static void ccc_read(struct gatt_db_attribute *attrib, unsigned int id,
+ uint16_t offset, uint8_t opcode, struct bt_att *att,
+ void *user_data)
+{
+ struct heartrate_data *hr = user_data;
+ uint8_t value[2] = { 0 };
+
+ if (queue_find(hr->to_notify, match_att, att))
+ value[0] = 0x01;
+
+ gatt_db_attribute_read_result(attrib, id, 0, value, sizeof(value));
+}
+
+static void remove_att(void *data, void *user_data)
+{
+ struct heartrate_data *hr = data;
+ struct bt_att *att = user_data;
+
+ if (!queue_find(hr->to_notify, match_att, att))
+ return;
+
+ queue_remove(hr->to_notify, att);
+
+ bt_att_unref(att);
+
+ if (queue_isempty(hr->to_notify)) {
+ timeout_remove(hr->notifier);
+ hr->notifier = -1;
+ }
+}
+
+static void remove_notify_cb(int err, void *user_data)
+{
+ struct bt_att *att = user_data;
+
+ queue_foreach(sensors, remove_att, att);
+}
+
+static bool send_notification(void *user_data)
+{
+ struct heartrate_data *hr = user_data;
+ const struct queue_entry *e;
+ uint8_t pdu[4];
+
+ e = queue_get_entries(hr->to_notify);
+ if (!e)
+ return true;
+
+ put_le16(hr->handle, &pdu[0]);
+
+ pdu[2] = 0x06;
+ pdu[3] = hr->beats_per_window * (60 / WINDOW_SIZE);
+
+ hr->beats_per_window = 0;
+
+ while (e) {
+ struct bt_att *att = e->data;
+ bt_att_send(att, BT_ATT_OP_HANDLE_VAL_NOT, pdu, sizeof(pdu), NULL, NULL, NULL);
+ e = e->next;
+ }
+
+ return true;
+}
+
+static void enable_notification(struct heartrate_data *hr, struct bt_att *att)
+{
+ if (queue_find(hr->to_notify, match_att, att)) {
+ return;
+ }
+
+ if (!queue_push_tail(hr->to_notify, bt_att_ref(att))) {
+ bt_att_unref(att);
+ return;
+ }
+
+ hr->disconnect_watch = bt_att_register_disconnect(att, remove_notify_cb, att, NULL);
+
+ if (hr->notifier != -1)
+ return;
+
+ hr->notifier = timeout_add(WINDOW_SIZE * 1000, send_notification, hr, NULL);
+}
+
+static void disable_notification(struct heartrate_data *hr, struct bt_att *att)
+{
+ if (!queue_remove(hr->to_notify, att))
+ return;
+
+ bt_att_unref(att);
+
+ if (queue_isempty(hr->to_notify)) {
+ timeout_remove(hr->notifier);
+ hr->notifier = -1;
+ }
+}
+
+static void ccc_write(struct gatt_db_attribute *attrib, unsigned int id,
+ uint16_t offset, const uint8_t *value, size_t len,
+ uint8_t opcode, struct bt_att *att, void *user_data)
+{
+ struct heartrate_data *hr = user_data;
+ uint8_t ecode = 0;
+
+ if (!value || len != 2) {
+ ecode = BT_ATT_ERROR_INVALID_ATTRIBUTE_VALUE_LEN;
+ goto done;
+ }
+
+ if (offset) {
+ ecode = BT_ATT_ERROR_INVALID_OFFSET;
+ goto done;
+ }
+
+ if (value[0] == 0x01)
+ enable_notification(hr, att);
+ else if (value[0] == 0x00)
+ disable_notification(hr, att);
+
+done:
+ gatt_db_attribute_write_result(attrib, id, ecode);
+}
+
+static void heartrate_register(struct gatt_db *db, void *user_data)
+{
+ struct heartrate_data *hr = user_data;
+ struct gatt_db_attribute *service, *chr;
+ bt_uuid_t uuid;
+
+ gatt_db = gatt_db_ref(db);
+
+ bt_uuid16_create(&uuid, 0x180d);
+
+ service = gatt_db_add_service(gatt_db, &uuid, true, 6);
+
+ /* Heart Rate Measurement characteristic */
+ bt_uuid16_create(&uuid, 0x2a37);
+ chr = gatt_db_service_add_characteristic(service, &uuid,
+ BT_ATT_PERM_NONE,
+ BT_GATT_CHRC_PROP_NOTIFY,
+ NULL, NULL, NULL);
+ hr->handle = gatt_db_attribute_get_handle(chr);
+
+ /* Heart Rate CCC descriptor */
+ bt_uuid16_create(&uuid, GATT_CLIENT_CHARAC_CFG_UUID);
+ gatt_db_service_add_descriptor(chr, &uuid,
+ BT_ATT_PERM_READ | BT_ATT_PERM_WRITE,
+ ccc_read, ccc_write, hr);
+
+ hr->service = service;
+
+ gatt_db_service_set_active(service, true);
+}
+
+static int heartrate_open(struct sol_flow_node *node, void *data,
+ const struct sol_flow_node_options *options)
+{
+ static bool initialized = false;
+ struct heartrate_data *hr = data;
+
+ if (!initialized) {
+ initialized = bluetooth_init();
+
+ if (!initialized) {
+ SOL_WRN("Could not initialize Bluetooth module");
+ return -EINVAL;
+ }
+ }
+
+ /* FIXME: remove when supporting multiple locations */
+ if (!queue_isempty(sensors))
+ return 0;
+
+ hr->to_notify = queue_new();
+ hr->notifier = -1;
+
+ gatt_server_add_service(heartrate_register, hr);
+
+ queue_push_tail(sensors, hr);
+
+ return 0;
+}
+
+static void heartrate_close(struct sol_flow_node *node, void *data)
+{
+ struct heartrate_data *hr = data;
+
+ if (hr->service)
+ gatt_db_remove_service(gatt_db, hr->service);
+
+ hr->service = NULL;
+
+ queue_destroy(hr->to_notify, (queue_destroy_func_t) bt_att_unref);
+
+ if (hr->notifier >= 0)
+ timeout_remove(hr->notifier);
+
+ hr->notifier = -1;
+
+ queue_remove(sensors, hr);
+
+ gatt_db_unref(gatt_db);
+}
+
+#include "heartrate-gen.c"
--
2.4.6
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