This session will cover everything needed to get started with smartstraps, from the hardware connection to APIs on the watch to the Arduino smartstrap library with Brian Gomberg (Embedded Developer). We will have limited hardware for people build with and take home!

1. 2015 Pebble Developer Retreat
Smartstraps
Brian Gomberg

2. What is a smartstrap?

3. Electrical Connection

4. GND GNDDATA PWR

5. Smartstrap Protocol

6. Smartstrap Protocol
• Master / slave model (watch is master)
• Notification mechanism
• Data arrives intact or not at all

7. Physical Layer
Link Layer
Profile Layer
Link Control Profile Raw Data Profile Generic Service Profile

8. Generic Service Profile
• Attributes and Services:
•An attribute is a distinct piece of information
•A service is a collection of related attributes

10. Defining Services and Attributes

11. Connection Process

12. Charging flux
capacitors!
What profiles
do you
support?
I support ALL
the profiles!
Profile Discovery
All Profiles Supported

13. Woot! Are
you ready to
go?
Let’s talk faster.Status Request
Change Baud Rate

14. What services
do you
support?
I support
service 0x1234,
the best service.
Service Discovery
Service 0x1234

15. static SmartstrapAttribute *color_attr;
static void init(void) {
const SmartstrapServiceId service_id = 0x1234;
const SmartstrapAttributeId attribute_id = 0x0042;
const size_t length = 1;
color_attr = smartstrap_attribute_create(service_id, attribute_id, length);
smartstrap_subscribe((SmartstrapHandlers) { ... });
}
static void deinit(void) {
smartstrap_attribute_destroy(color_attr);
smartstrap_unsubscribe();
}

16. static const uint16_t SERVICES[] = {0x1234};
static uint8_t buffer[GET_PAYLOAD_BUFFER_SIZE(1)];
void setup() {
const uint8_t pin = 1;
ArduinoPebbleSerial::begin_software(pin, buffer, sizeof(buffer), Baud57600, SERVICES, 1);
}

17. Reading Attributes

18. What is your
favorite
color?
I like green.
Read 0x1234, 0x0042
0b11001100

19. smartstrap_attribute_read(color_attr);

20. uint16_t service_id, attribute_id;
size_t length;
RequestType type;
if (ArduinoPebbleSerial::feed(&service_id, &attribute_id, &length, &type)) {
// ...
buffer[0] = 0b11110111;
ArduinoPebbleSerial::write(true, buffer, 1);
}

21. static void prv_did_read_handler(SmartstrapAttribute *attribute, SmartstrapResult result,
const uint8_t *data, size_t length) {
// handle read...
}

22. Notifications

23. Wait! I change
my mind!
Notification
0x1234, 0x0042

24. ArduinoPebbleSerial::notify(0x1234, 0x0042);

25. static void prv_notify_handler(SmartstrapAttribute *attribute) {
// ...
}

26. Demo

27. Smartstrap AdapterPebble Time Teensy 3.1

29. Links
• Documentation: http://developer.pebble.com/guides/hardware/
• Arduino Library: https://github.com/pebble/ArduinoPebbleSerial
• Teensy 3.2: https://www.pjrc.com/store/teensy32.html

30. Examples

37. Questions?
Slack Room: #smartstraps
Email: bgomberg@pebble.com