Iono MKR LoRaWAN

This sketch turns Iono MKR into a LoRaWAN Class A/C end-device, using ABP activation and sending data encoded with the Cayenne LPP format.

This sketch includes the CayenneLPP library and the (modified) MKRWAN library.

Configuration

After uploading the sketch to Iono MKR, you'll be able to configure it via serial console.

The configuration console can be accessed through the module's RS-485 port or Arduino's USB port using any serial communication application (e.g. the Serial Monitor of the Arduino IDE).

Set the communication speed to 9600, 8 bits, no parity, no flow-control and connect the cable.

When the module is powered-up or reset, you can enter console mode by typing five or more consecutive space characters within 20 seconds from boot. The following will be printed:

=== Sfera Labs - Iono MKR LoRaWAN configuration - v1.0.0 ===

    1. Import configuration
    2. Export configuration

> 

Enter 2 to print out the current configuration. If the device is not configured, an example configuration will be printed:

> 2

*** Not configured ***

Example:

devAddr: 00000000
nwkSKey: 00000000000000000000000000000000
appSKey: 00000000000000000000000000000000
band: EU
data rate: 5
input modes: DDDDDD
I/O rules: ----

Copy the configuration lines to a text editor and edit the parameters:

• devAddr: 4-bytes device address in hexadecimal format
• nwkSKey: 16-bytes network key in hexadecimal format
• appSKey: 16-bytes application key in hexadecimal format
• band: regional band to use. Allowed values are: AU, EU, KR, IN and US
• data rate: 0 (SF 12, BW 125), 1 (SF 11, BW 125), 2 (SF 10, BW 125), 3 (SF 9, BW 125), 4 (SF 8, BW 125), or 5 (SF 7, BW 125)
• inputs modes: input mode of each of the 6 inputs: inputs 1 to 4 can be used as digital (D), voltage (V) or current (I); inputs 5 and 6 only as digital. If you do not want an input to trigger LoRaWAN updates, set it to "ignore" (-). E.g.: D-VID- means the following inputs will be monitored: DI1, AV3, AI4, and DI5
• I/O rules: linking rules between digital inputs and corresponding output relay (DI1 -> DO1 ... DI4 -> DO4). The possible rules are:
  • F: follow - the relay is closed when input is high and open when low
  • I: invert - the relay is closed when input is low and open when high
  • H: flip on L>H transition - the relay is flipped at any input transition from low to high
  • L: flip on H>L transition - the relay is flipped at any input transition from high to low
  • T: flip on any transition - the relay is flipped at any input transition, both high to low and low to high
  • -: no rule - no control rule set for this relay.

After editing the configuration, enter 1 (Import configuration) in the serial console, copy all the lines together and paste them to the console:

> 1

Paste the configuration:

New configuration:

devAddr: 0011aabb
nwkSKey: 85f07ac17324760061e5d94dafcb7135
appSKey: ba069e01c4ca27535460a2b13ee6a515
band: EU
data rate: 5
input modes: D-VID-
I/O rules: FI--

Confirm? (Y/N):

> Y

Saving...
Saved!
Resetting... bye!

Review and confirm (enter Y) the configuration. After saving, Iono MKR will automatically restart with the new configuration which is persisted in the Arduino's Flash memory and retained across restarts and power cycles.

Data format

When configured, Iono MKR will start sending state uplinks periodically and upon state changes. The packet payload is encoded using the Cayenne LPP format.

The full state (i.e. all enabled Cayenne channels, see below) is sent at start-up and then every 15 minutes or every 7 minutes if no other update is sent.

Partial updates are sent when monitored inputs or outputs change state. A 50ms debounce is used on digital and analog inputs and a min variation of 0.1V or 0.1mA is required on analog inputs to trigger an update.

Moreover, a heartbeat containing only channel 99 is sent every 3 minutes.

Downlink commands, encoded in Cayenne LLP format, can be sent at any time to change the state of the outputs (Cayenne channels 101 to 104 and 201).

Cayenne channels

Channels	Type	Description
1 ... 6	Digital Input	DI1 ... DI6 state
11 ... 14	Analog Input	AV1 ... AV4 voltage (V)
21 ... 24	Analog Input	AI1 ... AI4 current (mA)
51 ... 56	Analog Input	DI1 ... DI6 counter, increased on every rising edge. Range: 0-327 (rolls back to 0 after 327)
101 ... 104	Digital Output	DO1 ... DO4 state
201	Analog Output	AO1 voltage (V)
99	N/A	2-bytes internal counter