def send_heart_rate_measurement():
hvx_params = ble_driver.ble_gatts_hvx_params_t()
encoded_hrm = ble_driver.uint8_array(MAX_HRM_LEN)
generate_heart_rate()
length = encode_heart_rate_measurement(encoded_hrm, heart_rate)
hvx_length = ble_driver.new_uint16()
ble_driver.uint16_assign(hvx_length, length)
hvx_params.handle = heart_rate_measurement_handle.value_handle
hvx_params.type = ble_driver.BLE_GATT_HVX_NOTIFICATION
hvx_params.offset = 0
hvx_params.p_len = hvx_length
hvx_params.p_data = encoded_hrm.cast()
error_code = ble_driver.sd_ble_gatts_hvx(connection_handle, hvx_params)
actual_hvx_length = ble_driver.uint16_value(hvx_length)
ble_driver.delete_uint16(hvx_length)
if error_code == ble_driver.NRF_SUCCESS and length != actual_hvx_length:
error_code = ble_driver.NRF_ERROR_DATA_SIZE
print "Failed to send heart rate measurement. Error code: 0x{0:02X}".format(error_code)
return error_code
if error_code != ble_driver.NRF_SUCCESS:
print "Failed to send heart rate measurement. Error code: 0x{0:02X}".format(error_code)
return error_code
return ble_driver.NRF_SUCCESS
def send_heart_rate_measurement():
hvx_params = ble_driver.ble_gatts_hvx_params_t()
encoded_hrm = ble_driver.uint8_array(MAX_HRM_LEN)
generate_heart_rate()
length = encode_heart_rate_measurement(encoded_hrm, heart_rate)
hvx_length = ble_driver.new_uint16()
ble_driver.uint16_assign(hvx_length, length)
hvx_params.handle = heart_rate_measurement_handle.value_handle
hvx_params.type = ble_driver.BLE_GATT_HVX_NOTIFICATION
hvx_params.offset = 0
hvx_params.p_len = hvx_length
hvx_params.p_data = encoded_hrm.cast()
error_code = ble_driver.sd_ble_gatts_hvx(connection_handle, hvx_params)
actual_hvx_length = ble_driver.uint16_value(hvx_length)
ble_driver.delete_uint16(hvx_length)
if error_code == ble_driver.NRF_SUCCESS and length != actual_hvx_length:
error_code = ble_driver.NRF_ERROR_DATA_SIZE
print "Failed to send heart rate measurement. Error code: 0x{0:02X}".format(error_code)
return error_code
if error_code != ble_driver.NRF_SUCCESS:
print "Failed to send heart rate measurement. Error code: 0x{0:02X}".format(error_code)
return error_code
return ble_driver.NRF_SUCCESS
def init_characteristics():
char_md = ble_driver.ble_gatts_char_md_t()
cccd_md = ble_driver.ble_gatts_attr_md_t()
attr_char_value = ble_driver.ble_gatts_attr_t()
ble_uuid = ble_driver.ble_uuid_t()
attr_md = ble_driver.ble_gatts_attr_md_t()
encoded_initial_hrm = ble_driver.uint8_array(MAX_HRM_LEN)
cccd_md.read_perm.sm = 1
cccd_md.read_perm.lv = 1
cccd_md.write_perm.sm = 1
cccd_md.write_perm.lv = 1
cccd_md.vloc = ble_driver.BLE_GATTS_VLOC_STACK
char_md.char_props.notify = 1
char_md.p_char_user_desc = None
char_md.p_char_pf = None
char_md.p_user_desc_md = None
char_md.p_cccd_md = cccd_md
char_md.p_sccd_md = None
ble_uuid.type = ble_driver.BLE_UUID_TYPE_BLE
ble_uuid.uuid = 0x2A37
attr_md.read_perm.sm = 1
attr_md.read_perm.lv = 1
attr_md.write_perm.sm = 1
attr_md.write_perm.lv = 1
attr_md.vloc = ble_driver.BLE_GATTS_VLOC_STACK
attr_md.rd_auth = 0
attr_md.wr_auth = 0
attr_md.vlen = 1
attr_char_value_init_len = encode_heart_rate_measurement(
encoded_initial_hrm, 10)
attr_char_value.p_uuid = ble_uuid
attr_char_value.p_attr_md = attr_md
attr_char_value.init_len = attr_char_value_init_len
attr_char_value.init_offs = 0
attr_char_value.max_len = MAX_HRM_LEN
attr_char_value.p_value = encoded_initial_hrm.cast()
error_code = ble_driver.sd_ble_gatts_characteristic_add(
heart_rate_service_handle, char_md, attr_char_value,
heart_rate_measurement_handle)
if error_code != ble_driver.NRF_SUCCESS:
print "Failed to initialize characteristics. Error code: 0x{0:02X}".format(
error_code)
return error_code
print "Characteristics initiated"
return ble_driver.NRF_SUCCESS
def init_characteristics():
char_md = ble_driver.ble_gatts_char_md_t()
cccd_md = ble_driver.ble_gatts_attr_md_t()
attr_char_value = ble_driver.ble_gatts_attr_t()
ble_uuid = ble_driver.ble_uuid_t()
attr_md = ble_driver.ble_gatts_attr_md_t()
encoded_initial_hrm = ble_driver.uint8_array(MAX_HRM_LEN)
cccd_md.read_perm.sm = 1
cccd_md.read_perm.lv = 1
cccd_md.write_perm.sm = 1
cccd_md.write_perm.lv = 1
cccd_md.vloc = ble_driver.BLE_GATTS_VLOC_STACK
char_md.char_props.notify = 1
char_md.p_char_user_desc = None
char_md.p_char_pf = None
char_md.p_user_desc_md = None
char_md.p_cccd_md = cccd_md
char_md.p_sccd_md = None
ble_uuid.type = ble_driver.BLE_UUID_TYPE_BLE
ble_uuid.uuid = 0x2A37
attr_md.read_perm.sm = 1
attr_md.read_perm.lv = 1
attr_md.write_perm.sm = 1
attr_md.write_perm.lv = 1
attr_md.vloc = ble_driver.BLE_GATTS_VLOC_STACK
attr_md.rd_auth = 0
attr_md.wr_auth = 0
attr_md.vlen = 1
attr_char_value_init_len = encode_heart_rate_measurement(encoded_initial_hrm, 10)
attr_char_value.p_uuid = ble_uuid
attr_char_value.p_attr_md = attr_md
attr_char_value.init_len = attr_char_value_init_len
attr_char_value.init_offs = 0
attr_char_value.max_len = MAX_HRM_LEN
attr_char_value.p_value = encoded_initial_hrm.cast()
error_code = ble_driver.sd_ble_gatts_characteristic_add(heart_rate_service_handle,
char_md,
attr_char_value,
heart_rate_measurement_handle)
if error_code != ble_driver.NRF_SUCCESS:
print "Failed to initialize characteristics. Error code: 0x{0:02X}".format(error_code)
return error_code
print "Characteristics initiated"
return ble_driver.NRF_SUCCESS
