User Manual

AWS IoT ExpressLink SARA-R5 Starter Kit - Getting started
UBX-21042016 - R02 Features supported Page 18 of 20
C1-Public
8 Features supported
The firmware provided on the u-blox AWS IoT ExpressLink SARA-R5 module in this evaluation kit is a
preview release and hence it does NOT support all the features of the AWS IoT ExpressLink command
set. The following commands are supported:
CONNECT, DISCONNECT, SLEEP
2
, RESET, FACTORY_RESET, SEND
3
, GET
4
, SUBSCRIBE,
UNSUBSCRIBE, CONF, EVENT, DIAG, TIME
5
.
For the avoidance of doubt, the following commands are not currently supported:
CONFMODE, OTA, HOTA, WHERE.
☞ OTA of the module is supported but only through u-blox uFOTA since it must work within the
constraints applied by the cellular network operators.
For the CONF command, only the following parameters are supported:
About, Version, ThingName, Certificate (
without pem after it), EndPoint, APN, TopicRoot, TopicX
(where X is 1 to 16, i.e., MaxTopic is 16).
☞ The power-on behavior of the module is defined by the underlying SARA-R5 HW, i.e. the module
does not power on until the PWR_ON pin is asserted for 1 second and then released, see the u-blox
SARA-R5 data sheet
for more details; the pin MUST be released as if it is held for more than
16 seconds an emergency restart of the module will be performed. On the SparkFun MicroMod
Asset Tracker board a “SARA On” button is provided which will assert the PWR_ON pin while
pressed.
☞ The PWR_ON pin is a toggle, i.e., if it is asserted for 1 second and then released while the module is
powered on then the module will power off again. It is ALWAYS a good idea to power the module
off in this way before physically removing power.
☞ From the perspective of the SARA-R5 module, “asserted” means “pulled low” but the SparkFun
MicroMod Asset Tracker Carrier Board includes an inverter in the line and hence, from the
perspective of an MCU on a MicroMod processor board, asserted means “held high”.
☞ The behavior of the WAKE pin described in the AWS ExpressLink documentation is not supported.
☞ The behavior of the RST pin described in the AWS ExpressLink documentation is offered by the
RESET_N pin of the module. On the SparkFun MicroMod Asset Tracker Board a “Reset” button is
provided that will effect a reset of the module.
2
While the command is supported the module does NOT currently enter a low power state, i.e. the command is only “emulated”.
3
The maximum AT command-line length in this release is 512 bytes, which will set a limit on the maximum size of an MQTT
message being sent.
4
The maximum receive message size is 2048 bytes.
5
Must be connected to work and not all cellular networks support indication of time to the mobile terminal.