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Functional Description

Overview

miro Outsight is a battery powered and fully configurable LoRaWAN® class A environmental sensor.

The device features the following sensors: - temperature - humidity - light - pressure - interface for external sensors

It reads out the sensors in a configurable interval and sends the data via LoRaWAN 1.0.3 either after each read out, or after accumulating[^1] a given amount of data.

Additionally, the miro Outsight is equipped with a hall-sensor (not available on all devices). Together with a magnet, it can be used to monitor doors or windows and send messages when they stay open for too long.

All settings, such as measurement time and accumulated data points, can be configured using LoRaWAN® downlink messages.

miro Outsight comes in an IP67 casing with different options: - Cable gland for external sensors - Membrane

The device is powered with a single AA battery.

LoRaWAN keys

If you did not receive the LoRaWAN keys from Miromico AG directly, you should be able to retrieve them from our database. Please visit our DevEUI management docs page.

Power on

After the first power on (or a reset), the device will try to join. After a join, the sensors are immediately read out for the first time.

Confirmed messages

If an uplink is sent as a confirmed message, the device expects an acknowledgement (ACK) from the LoRaWAN network. When no ACK is received, the miro Insight will try to retransmit the message again, up to the configured amount of tries (NbRetrans). If still no ACK is received, the measurements are discarded.

In the unlikely case that the accumulated data exceeds the maximum allowed payload size (LoRaWAN regulations), the oldest measurements will be discarded and lost. As many new data points as possible will be sent with the uplink. This scenario might happen if the datarate is decreased during retries (see ADR ACK request).

Reset

Tor remotely reset the sensor device, a reset downlink command is implemented.

ADR ACK request

Important

For US915 and AU915 regions, ADR is disabled and the datarate is fixed to 3 (SF7), because otherwise the allowed payload size is too small for even single measurements for some sensor configurations.

The ADR ACK request is a LoRaWAN feature to ensure that a device will stay connected to a network when ADR is enabled.

After 5 messages without any response from the network the miro Insight will ask the network to respond with the next uplink. If the network fails to answer for 2 uplinks, the device will lower its datarate, to increase the chances of a message getting to the gateway. This continues, until either the network answers and the initial counter is reset, or 2 uplinks are sent with datarate 0 (SF12). If the network still has not answered, the device will reset and try to join again. With default settings, a device will approximately reset itself after not hearing from the network in one day.

This feature is useful, if a device is moved or connectivity changes. In the case that a device is reregistered in a different network, it will also try to join again on its own and no manual reset has to be performed.

LED Description

The onboard LED indicates the following states: - Flash Blue: LoRaWAN transmission - Flash Green: LoRaWAN reception or successful network join. - Flash Red: failed network join.

Onboard LED indications can be enabled/disabled through a LoRaWAN downlink message. Only the indications about the network join can't be disabled.

Known issues