XBee Cellular
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Customer Release Notes
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Copyright (C) 2018, Digi International

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### Overview:

These release notes document changes made to the XBee Cellular.

### Compatible Hardware:

* Digi XBee Cellular LTE Cat 1 AT&T

### Links:

[Product Information](https://www.digi.com/lp/digi-xbee-cellular)

### Current Known Issues / Errata:

* Module with SPI mode enabled and pending Status frames to send to the SPI 
  Master will not go to sleep.

* 3732 Closing a TLS session and then immediately opening a new one
       may result in failure. To workaround, insert a small delay (~5s)

* 3100 Intermittent failure to go to sleep or wake up when using pin sleep
       with the SPI_nSSEL line while in SPI mode
       
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### Release Version

3100C - XBee Cellular LTE Cat 1 AT&T

### Release Date

* September 2018       
    
### Bug Fixes (XBCELL):

* 3861 Fixed issues with a memory leak when using TLS mutual authentication 
       and additional sockets cannot be opened.
* 4091 Sequence to initially connect to cellular network improved.
       
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### Release Version

3100B - XBee Cellular LTE Cat 1 AT&T

### Release Date

* June 2018

### New Features:

* File system support
    * ATFS command to access through Command Mode
    * MicroPython file interfaces for programmatic access
    * Provides MicroPython module import support
    * Allows storage of TLS certificates for authentication
    * Secure encrypted file storage to protect MicroPython code and
      TLS private keys

* TLS Authentication
    * Accessed in MicroPython with the ussl.wrap_socket method
    * Configurable with the $0/$1/$2 commands
    * Uses certificates stored on the filesystem
    * New API frame 0x23 to access multiple authentication profiles

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### Release Version:

* 3100A - XBee Cellular LTE Cat 1 AT&T 

### Release Date:

* 2017-December-14

### New Features:

* Initial release
* Key features:
    * Digital I/O support.
    * Analog Input support.    
    * API & Transparent mode
    * AT command mode
    * By-pass to raw cellular modem
    * SMS
    * TCP/UDP (up to ten sockets)
    * TLS/TCP (up to six socket)
    * Incoming connections
    * MicroPython!
        * On-module programmability to add local intelligence.
        * Many examples in the Digi MicroPython Programmer Guide.
        * AT commands for managing run-time behavior.
    * Low power modes
        * Deep sleep mode.
        * Pin sleep support.
        * Cyclic sleep support.
        * Airplane mode sleep support.
    * SMS UTF-16/UCS-2 encoding support.
    
### Bug Fixes (XBCELL):

* None