Creating Payload Formatters

Create an Application Payload Formatter in the Console

To create an Application payload formatter, navigate to the Applications tab and choose your application.

Within the Application Overview, select the Payload Formatters dropdown in the left menu.

Choose Uplink or Downlink.

Choose a Formatter type.

Create a Device Specific Payload Formatter

To create a device specific payload formatter, navigate to the Applications tab. Choose your application.

Within the Application Overview, select End Devices in the left menu.

Choose your End Device.

Within the End Device Overview, select the Payload Formatters tab in the top menu.

Choose Uplink or Downlink.

Choose a Formatter type.

Create an Application Payload Formatter using the CLI

To create an application specific payload formatter, use the following command when linking an application. If creating a Javascript payload formatter, save your Encoder and Decoder functions to files and load them using the formatter-parameter-local-file parameter:

$ ttn-lw-cli applications link set app1 \
  --api-key NNSXS.VEEBURF3KR77ZR..
  --default-formatters.down-formatter FORMATTER_JAVASCRIPT \
  --default-formatters.down-formatter-parameter-local-file "encoder.js" \
  --default-formatters.up-formatter FORMATTER_JAVASCRIPT \
  --default-formatters.up-formatter-parameter-local-file "decoder.js"

To create a CayenneLPP or Device Repository application payload formatter, use the FORMATTER_CAYENNELPP or FORMATTER_DEVICEREPO constants. No formatter-parameter-local-file parameter is needed.

Create a Device Specific Payload Formatter

It is possible to assign a device specific payload formatter when creating a device using the CLI. Use the following parameters during device creation, and if creating a Javascript payload formatter, save your Encoder and Decoder functions to files and load them using the formatter-parameter-local-file parameter:

$ ttn-lw-cli end-devices create app1 dev1-with-formatter \
  --dev-eui 0004A30B001C0530 \
  --app-eui 800000000000000C \
  --frequency-plan-id EU_863_870 \
  --root-keys.app-key.key 752BAEC23EAE7964AF27C325F4C23C9A \
  --lorawan-version 1.0.3 \
  --lorawan-phy-version 1.0.3-a \
  --formatters.down-formatter FORMATTER_JAVASCRIPT \
  --formatters.down-formatter-parameter-local-file "encoder.js" \
  --formatters.up-formatter FORMATTER_JAVASCRIPT \
  --formatters.up-formatter-parameter-local-file "decoder.js"

To create a CayenneLPP or Device Repository device payload formatter, use the FORMATTER_CAYENNELPP or FORMATTER_DEVICEREPO constants. No formatter-parameter-local-file parameter is needed.

Edit a Device Specific Payload Formatter

To change the payload formatter for an existing device, use the end-devices update command:

$ ttn-lw-cli end-devices set app1 dev1-with-formatter \
  --formatters.down-formatter FORMATTER_JAVASCRIPT \
  --formatters.down-formatter-parameter-local-file "encoder.js" \
  --formatters.up-formatter FORMATTER_JAVASCRIPT \
  --formatters.up-formatter-parameter-local-file "decoder.js"

To unset the payload formatters, use the --unset flag. The command below will unset all device specific payload formatters:

$ ttn-lw-cli end-devices set app1 dev1-with-formatter \
  --unset "formatters"

It is also possible to unset the uplink or downlink formatters separately:

$ ttn-lw-cli end-devices set app1 dev1-with-formatter \
  --unset "formatters.up-formatter,formatters.up-formatter-parameter"