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hub Requests

The hub set of requests provide a variety of ways for a developer to configure and monitor the connection between the Notecard and Notehub.

Notecard Firmware Version:
7.x
Latest (9.x)8.x LTS7.x6.x LTS5.x4.x LTS3.x2.x LTS

hub.get CellCell+WiFiLoRaWiFi

Retrieves the current Notehub configuration for the Notecard.

Arguments
None
{
  "req": "hub.get"
}
J *req = NoteNewRequest("hub.get");

NoteRequest(req);
req = {"req": "hub.get"}
rsp = card.Transaction(req)
Response Members

device

string

The DeviceUID for the Notecard.

product

string

The ProductUID to which the Notecard is registered.

mode

string

The current operating mode of the Notecard, as defined in hub.set.

outbound

integer

The max wait time, in minutes, to sync outbound data from the Notecard.

voutbound

string

If outbound is overridden with a voltage-variable value.

inbound

integer

The max wait time, in minutes, to sync inbound data from Notehub.

vinbound

string

If inbound has been overridden with a voltage-variable value.

host

string

The URL of the Notehub host.

sn

string

The serial number of the device, if set.

sync

boolean

true if the device is in continuous mode and set to sync every time a change is detected.

Example Response
{
  "device": "dev:000000000000000",
  "product": "com.your-company.your-name:your_product",
  "mode": "periodic",
  "outbound": 60,
  "inbound": 240,
  "host": "a.notefile.net",
  "sn": "your-serial-number"
}

hub.log CellCell+WiFiWiFi

Add a "device health" log message to send to Notehub on the next sync via the _health_host.qo Notefile.

See hub.log in action as part of the Cold Chain Monitor accelerator project.

Arguments

text

string

alert

boolean

true if the message is urgent. This doesn't change any functionality, but rather alert is provided as a convenient flag to use in your program logic.

sync

boolean

true if a sync should be initiated immediately. Setting true will also remove the Notecard from certain types of penalty boxes.

{
  "req": "hub.log",
  "text": "something is wrong!",
  "alert": true,
  "sync": true
}
J *req = NoteNewRequest("hub.log");
JAddStringToObject(req, "text", "something is wrong");
JAddBoolToObject(req, "alert", true);
JAddBoolToObject(req, "sync", true);

NoteRequest(req);
req = {"req": "hub.log"}
req["text"] = "something is wrong!"
req["alert"] = True
req["sync"] = True
card.Transaction(req)
Response Members
None: an empty object {} means success.
More information:

hub.set CellCell+WiFiLoRaWiFi

The hub.set request is the primary method for controlling the Notecard's Notehub connection and sync behavior.

Arguments

product

string (optional)

A Notehub-managed unique identifier that is used to match Devices with Projects. This string is used during a device's auto-provisioning to find the Notehub Project that, once provisioned, will securely manage the device and its data.

host

string (optional)

The URL of the Notehub service. Use "-" to reset to the default value.

mode

string (optional)

The Notecard's synchronization mode. Must be one of:

periodic

Periodically connect to the Notehub. This is the default value set on each Notecard after a factory reset.

continuous

Enables an always-on network connection, for high power devices. Outbound data still syncs periodically, unless specified in a Note or File request.

minimum

Disables periodic connection. The Notecard will not sync until it receives an explicit hub.sync request. OTA DFU (for both host MCU and Notecard updates) is not available on Notecard when using this mode.

off

Disables automatic and manual syncs. hub.sync requests will be ignored in this mode. OTA DFU (for both host MCU and Notecard updates) is not available on Notecard when using this mode.

dfu

Puts the Notecard in DFU mode for IAP host MCU firmware updates. This mode is effectively the same as off in terms of the Notecard's network and Notehub connections.

sn

string (optional)

The end product's serial number.

outbound

integer (optional)

The max wait time, in minutes, to sync outbound data from the Notecard. Explicit syncs (e.g. using hub.sync) do not affect this cadence.

When in periodic or continuous mode this argument is required, otherwise the Notecard will function as if it is in minimum mode as it pertains to syncing behavior.

Use -1 to reset the value back to its default of 0.

A value of 0 means that the Notecard will never sync outbound data unless explicitly told to do so (e.g. using hub.sync).

duration

integer (optional)

When in continuous mode, the amount of time, in minutes, of each session (the minimum allowed value is 15). When this time elapses, the Notecard gracefully ends the current session and starts a new one in order to sync session-specific data to Notehub.

voutbound

string (optional)

Overrides outbound with a voltage-variable value. See Modem Power Management for more information on configuring voutbound. Use "-" to clear this value.

NOTE: Setting voltage-variable values is not supported on Notecard for LoRa or Notecard XP.

inbound

integer (optional)

The max wait time, in minutes, to sync inbound data from Notehub. Explicit syncs (e.g. using hub.sync) do not affect this cadence.

When in periodic or continuous mode this argument is required, otherwise the Notecard will function as if it is in minimum mode as it pertains to syncing behavior.

Use -1 to reset the value back to its default of 0.

A value of 0 means that the Notecard will never sync inbound data unless explicitly told to do so (e.g. using hub.sync).

vinbound

string (optional)

Overrides inbound with a voltage-variable value. Use "-" to clear this value.

NOTE: Setting voltage-variable values is not supported on Notecard for LoRa or Notecard XP.

align

boolean (optional)

Use true to align syncs on a regular time-periodic cycle.

For example: Assuming outbound = 15 minutes, with align:true the Notecard will look at UTC time, and when it's an even multiple of 15, it will perform a sync. Without align (the default behavior), it will wait 15 minutes after the previously completed sync.

sync

boolean (optional)

If in continuous mode, automatically and immediately sync each time an inbound Notefile change is detected on Notehub.

NOTE: The sync argument is not supported on Notecard for LoRa, or when a Notecard is in NTN mode.

on

boolean (optional)

If in periodic mode, used to temporarily switch the Notecard to continuous mode to perform a web transaction.

Ignored if the Notecard is already in continuous mode or if the Notecard is NOT performing a web transaction.

seconds

integer (optional)

If in periodic mode and using on above, the number of seconds to run in continuous mode before switching back to periodic mode. If not set, a default of 300 seconds is used. Ignored if the Notecard is already in continuous mode.

off

boolean (optional)

Set to true to manually instruct the Notecard to resume periodic mode after a web transaction has completed.

uperiodic

boolean (optional)

Set to true to use USB/line power variable sync behavior, enabling the Notecard to stay in continuous mode when connected to USB/line power and fallback to periodic mode when disconnected.

umin

boolean (optional)

Set to true to use USB/line power variable sync behavior, enabling the Notecard to stay in continuous mode when connected to USB/line power and fallback to minimum mode when disconnected.

uoff

boolean (optional)

Set to true to use USB/line power variable sync behavior, enabling the Notecard to stay in continuous mode when connected to USB/line power and fallback to off mode when disconnected.

details

JSON object (optional)

When using Notecard LoRa you can use this argument to provide information about an alternative LoRaWAN server or service you would like the Notecard to use. The argument you provide must be a JSON object with three keys, "deveui", "appeui", and "appkey", all of which are hexadecimal strings with no leading 0x. For example:

{"deveui":"0080E11500088B37","appeui":"6E6F746563617264","appkey":"00088B37"}

The LoRaWAN details you send to a Notecard become part of its permanent configuration, and survive factory resets. You can reset a Notecard's LoRaWAN details to its default values by providing a "-" for the details argument.

version

string (optional)

The version of your host firmware. The value provided will appear on your device in Notehub under the "Host Firmware" tab.

You may pass a simple version number string (e.g. "1.0.0.0"), or an object with detailed information about the firmware image. If you provide an object it must take the following form.

{"org":"my-organization","product":"My Product","description":"A description of the image","version":"1.2.4","built":"Jan 01 2025 01:02:03","ver_major":1,"ver_minor":2,"ver_patch":4,"ver_build": 5,"builder":"The Builder"}

If your project uses Notecard Outboard Firmware Update, you can alternatively use the dfu.status request to set your host firmware version.

{
  "req": "hub.set",
  "product": "com.your-company.your-name:your_product",
  "sn": "my-device"
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "product", "com.your-company.your-name:your_product");
JAddStringToObject(req, "sn", "my-device");

NoteRequest(req);
req = {"req": "hub.set"}
req["product"] = "com.your-company.your-name:your_product"
req["sn"] = "my-device"
card.Transaction(req)

Change your device's ProductUID to "com.your-company.your-name:your_product" and serial number to "my-device".

{
  "req": "hub.set",
  "mode": "periodic",
  "outbound": 90,
  "inbound": 240
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "mode", "periodic");
JAddNumberToObject(req, "outbound", 90);
JAddNumberToObject(req, "inbound", 240);

NoteRequest(req);
req = {"req": "hub.set"}
req["mode"] = "periodic"
req["outbound"] = 90
req["inbound"] = 240
card.Transaction(req)

Place your device in periodic mode, performing outbound synchronizations with Notehub every 90 minutes and inbound synchronizations every 240 minutes.

{
  "req": "hub.set",
  "mode": "continuous",
  "outbound": 30,
  "inbound": 60,
  "duration": 240,
  "sync": true
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "mode", "continuous");
JAddNumberToObject(req, "outbound", 30);
JAddNumberToObject(req, "inbound", 60);
JAddNumberToObject(req, "duration", 240);
JAddBoolToObject(req, "sync", true);

NoteRequest(req);
req = {"req": "hub.set"}
req["mode"] = "continuous"
req["outbound"] = 30
req["inbound"] = 60
req["duration"] = 240
req["sync"] = True
card.Transaction(req)

Place your device in continuous mode, performing outbound synchronizations with Notehub every 30 minutes and inbound synchronizations every 60 minutes. Setting the duration to 240 tells the Notecard to begin a new session every 240 minutes, and setting sync to true tells the Notecard to automatically and immediately sync each time an inbound change is detected on Notehub.

{
  "req": "hub.set",
  "mode": "minimum"
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "mode", "minimum");

NoteRequest(req);
req = {"req": "hub.set"}
req["mode"] = "minimum"
card.Transaction(req)

Place your device in minimum mode. In minimum mode, a Notecard only performs synchronizations when it receives an explicit hub.sync request.

{
  "req": "hub.set",
  "mode": "off"
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "mode", "off");

NoteRequest(req);
req = {"req": "hub.set"}
req["mode"] = "off"
card.Transaction(req)

Place your device in "off" mode. In off mode, all network communication on the Notecard is disabled.

{
  "req": "hub.set",
  "host": "a.mynotehub.net"
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "host", "a.mynotehub.net");

NoteRequest(req);
req = {"req": "hub.set"}
req["host"] = "a.mynotehub.net"
card.Transaction(req)

Configure the Notecard to use an alternative Notehub service.

{
  "req": "hub.set",
  "mode": "periodic",
  "voutbound": "usb:30;high:60;normal:90;low:120;dead:0",
  "vinbound": "usb:60;high:120;normal:240;low:480;dead:0"
}
J *req = NoteNewRequest("hub.set");
JAddStringToObject(req, "mode", "periodic");
JAddStringToObject(req, "voutbound", "usb:30;high:60;normal:90;low:120;dead:0");
JAddStringToObject(req, "vinbound", "usb:60;high:120;normal:240;low:480;dead:0");

NoteRequest(req);
req = {"req": "hub.set"}
req["mode"] = "periodic"
req["voutbound"] = "usb:30;high:60;normal:90;low:120;dead:0"
req["vinbound"] = "usb:60;high:120;normal:240;low:480;dead:0"
card.Transaction(req)

Using voutbound and vinbound allows you to define synchronization periods that are dependent on the voltage of the device. This is most commonly used to synchronize more frequently when a device is on USB power, and less frequently when a device is low on battery. Learn more in Voltage-Variable Sync Behavior.

Response Members
None: an empty object {} means success.
More information:

hub.signal CellCell+WiFiWiFi

Receive a signal (a near-real-time note) from Notehub.

This request checks for an inbound signal from Notehub. If it finds a signal, this request returns the signal's body and deletes the signal. If there are multiple signals to receive, this request reads and deletes signals in FIFO (first in first out) order.

warning

A Notecard must be in continuous mode and have its sync argument set to true to receive signals.

{
  "req": "hub.set",
  "mode": "continuous",
  "sync": true
}
note

See our guide to Using Inbound Signals for more information on how to set up a host microcontroller or single-board computer to receive inbound signals.

Arguments

seconds

integer (optional)

The number of seconds to wait before timing out the request.

{ "req": "hub.signal" }
J *req = NoteNewRequest("hub.signal");

NoteRequest(req);
req = {"req": "hub.signal"}
rsp = card.Transaction(req)
Response Members

body

JSON object

The JSON body of a received signal.

connected

boolean

true if the Notecard is connected to Notehub.

signals

integer

The number of queued signals remaining.

Example Response
{
  "body": {
    "example-key": "example-value"
  },
  "connected": true
}
More information:

hub.status CellCell+WiFiLoRaWiFi

Displays the current status of the Notecard's connection to Notehub.

Arguments
None
{"req": "hub.status"}
J *req = NoteNewRequest("hub.status");

NoteRequest(req);
req = {"req": "hub.status"}
rsp = card.Transaction(req)
Response Members

status

string

Details about the Notecard's transport (e.g. cellular, Wi-Fi, LoRa) connection status.

Use connected (below) to check if the Notecard is connected to Notehub.

connected

boolean

true if the Notecard is connected to Notehub.

Example Response
{
  "status":    "connected (session open) {connected}",
  "connected": true
}

hub.sync CellCell+WiFiLoRaWiFi

Manually initiates a sync with Notehub.

Arguments

allow

boolean

Set to true to remove the Notecard from certain types of penalty boxes (the default is false).

out

boolean

Set to true to only sync pending outbound Notefiles.

in

boolean

Set to true to only sync pending inbound Notefiles. Required when using NTN mode with Starnote to check for inbound Notefiles.

{"req": "hub.sync"}
J *req = NoteNewRequest("hub.sync");

NoteRequest(req);
req = {"req": "hub.sync"}
card.Transaction(req)
Response Members
None: an empty object {} means success.

hub.sync.status CellCell+WiFiLoRaWiFi

Check on the status of a recently triggered or previous sync.

Arguments

sync

boolean (optional)

true if this request should auto-initiate a sync pending outbound data.

{
  "req": "hub.sync.status"
}
J *req = NoteNewRequest("hub.sync.status");

NoteRequest(req);
req = {"req": "hub.sync.status"}
rsp = card.Transaction(req)
Response Members

status

string

The status of the current or previous sync. Refer to this listing for the meaning of the various status codes returned (e.g. {sync-end}).

mode

string

The current state of the wireless connectivity module in use.

time

UNIX Epoch time

Time of the last sync completion. Will only populate if the Notecard has completed a sync to Notehub to obtain the time.

alert

boolean

true if an error occurred during the most recent sync.

sync

boolean

true if the notecard has unsynchronized notes, or requires a sync to set its internal clock.

completed

integer

Number of seconds since the last sync completion.

requested

integer

Number of seconds since the last explicit sync request.

seconds

integer

If the Notecard is in a Penalty Box, the number of seconds until the penalty condition ends.

scan

boolean

Returns true if triangulation data was sent to Notehub in the most recent sync.

Example Response
{
  "status": "completed {sync-end}",
  "mode": "{modem-off}",
  "time": 1598367163,
  "alert": true,
  "sync": true,
  "completed": 1648
}
More information: