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Inventek IWIN AT command software allows users to establish Wi-Fi and BLE connections for IoT projects using the IWIN AT command set.   Here is a example of BLE eS-WiFi Module AT Command running on our ISM4343-M4G-L54 eS-WiFi module based on the Cypress combo radio CYW4343.


This example covers usage of the AT Command Set to communicate using BLE on the eS-WiFi combo modules.  This feature is supported in Inventek IWIN AT command set firmware version 6.2 or greater.  Firmware version 6.x supports both synchronous and asynchronous mode.  The default and preferred mode of communication is synchronous.


Supported BLE Services and Characteristics

The Primary Service is:



The Characteristic for Writing and Reading data is:



The advertise data is “ISM43XXX” along with the Primary Service.

The broadcast data is “ISM BLE SPP”


BLE AT Commands:

Turn the BLE Radio on or off, and bring up the BLE Stack using the JP at commands.

  1. JP=1 -> Turn on the BLE Radio and bring up the BLE Stack
  2. JP=0 -> Shutdown the BLE Radio. BLE Stack is active

Send Data Over BLE


JS=<number of bytes to send>, <ascii message to send>

Received Data Over BLE (Asynchronous Mode (JC=1))

Received data will be sent directly to the Console from the BLE Event Handler.  The data is bracket for easy parsing.


> [BLE   ] Rx Data



Report Battery Level Over BLE

JB=<0 to 100> -> which is 0% to 100%

The Lightblue BLE app can be used for interacting with the ISM43341 BLE Radio

The advertise data is “ISM43340”, and the Primary Service. The broadcast data is “ISM BLE SPP”.  Also, currently only a single Primary Service and a single Characteristic is available.  The Characteristic can be used for both writing and reading of Bluetooth Data at up to 256 bytes per message.


BLE AT Commands:


Turn the BLE Radio on or off, and bring up the BLE Stack (JP)


JP=1 → Turn on the BLE Radio and bring up the BLE Stack

JP=0 → Shutdown the BLE Radio. BLE Stack will remain active


Send Data Over BLE (JS)


JS,<n>,<data> → Send at most <n> bytes of data. <n> can be 1 to 255 bytes.


Received Data Over BLE (JR - Synchronous Mode)


JR → Read available receive data up to 255 bytes from BLE receive buffer

JR,<n> → Read at most <n> bytes of data from the BLE receive buffer.

            <n> can be 1 to 255 bytes.


JA  → Returns the number of bytes available in the BLE receive buffer.

JE → Returns the last BLE receive buffer error.  0 = normal (no errors),

            -1 = overflow (possible data loss)


Report Battery Level Over BLE (JB)


JB=<0 to 100> → represent the reported battery level value of 0% to 100%.


Set BLE Receive Compatible Mode to BLE AT Commands (JC)


JC=0 → Set BLE to Synchronous Mode → Default Synchronous Mode

            (JA, JE, JR Supported only when JC=0)


JC=1 → Set BLE to Asynchronous Mode

            ([BLE ] Rx Data\r\n<BLE Data>\r\n>)


Set BLE GAP Name (J0)


J0=<GAP Name> → Default “ISM BLE SPP”

            <Gap Name> is limited to 11 characters


Set BLE Advertisement (J1)


J1=<Advertisement Name> → Default “ISM4343W” or “ISM4334X”

            <Advertisement Name> is limited to 8 characters


Set Product Manufacture Name (J2)


J2=<Manufacture Name> → Default “Inventek Systems, LLC”

            <Product Manufacture Name> is limited to 12 characters


Set Product Model Number (J3)


J3=<Model Number> → Default “ISM4343” or ISM43341”

            <Product Model Number> is limited to 16 characters


Set Product Serial Number (J4)


J4=<Product Serial Number>

            <Product Serial Number> is limited to 16 characters


Set Product Hardware Revision Number (J5)


J5=<Product Hardware Revision Number>

            <Product Hardware Revision Number> is limited to 12 characters


Set Product Firmware Revision Number (J6)


J6=<Product Firmware Revsions Number>

            <Product Firmware Revision Number> is limited to 12 characters


Set Product Software Revision Number (J7)


J7=<Product Software Revision Number>

            <Product Firmware Revision Number> is limited to 12 characters


BLE AT Commands List


? - Show Application Information


J0 - BT/BLE-Set Device Name <Limit 11 Chars>

J1 - BT/BLE-Set Advertisement Name <Limit 8 Chars>

J2 - BT/BLE-Set Manufacture Name <Limit 12 Chars>

J3 - BT/BLE-Set Model Number <Limit 16 Chars>    

J4 - BT/BLE-Set Serial Number <Limit 16 Chars>

J5 - BT/BLE-Set Hardware Version <Limit 12 Chars>

J6 - BT/BLE-Set Firmware Version <Limit 12 Chars>

J7 - BT/BLE-Set Software Version <Limit 12 Chars>


JA - BT/BLE-Return Available Receive Bytes

JB - BT/BLE-Report Battery Level

JC - BT/BLE-Async Read Mode0 = sync(JR), 1 = async

JE - BT/BLE-Return RX Last Error


JP - BT/BLE-Start/Stop Device


JR - BT/BLE-Receive Data up to 255 bytes, or JR, <1 to 255> bytes

JS - BT/BLE-Send Data, JS,<number bytes>,<data bytes to send>


J? - Show BT/BLE Settings



Teraterm Script Macro Example


; Set time out (seconds)

timeout = 30


setsync 1

;Get start time

gettime timestr1


; Configurate your BLE Setting


sendln 'J0=Broadcast'

wait 'OK' 'ERROR'


sendln 'J1=Corp Ad'

wait 'OK' 'ERROR'


sendln 'J2=Product'

wait 'OK' 'ERROR'


sendln 'J3=Model'

wait 'OK' 'ERROR'


sendln 'J4=Serial'

wait 'OK' 'ERROR'


sendln 'J5=Hardware'

wait 'OK' 'ERROR'


sendln 'J6=Firmware'

wait 'OK' 'ERROR'


sendln 'J7=Software'

wait 'OK' 'ERROR'


; Start BLE

sendln 'JP=1'

wait 'OK' 'ERROR'


;Send 4 Bytes

sendln 'JS=4,1234'

wait 'OK' 'ERROR'


; Jump to end

goto end


; Error


sendln '***** Command Failed *****'


Lightblue Testing Tool

Inventek Systems announces the release of the ISM43903 low cost WiFi module for IoT applications. The ISM43903-R48-L54 is an 802.11 b/g/n, FCC/CE certified Wi-Fi module based on the Cypress CYW43903 embedded wireless system-on-a-chip (SoC). The module includes a 160 MHz ARM Cortex-R4 applications processor with 1MB SRAM, 640 KB ROM, and 64-Mbit SPI Flash Memory, as well as a second processor that supports a single stream IEEE 802.11n MAC/baseband/radio, a power amplifier (PA), a receive low-noise amplifier (LNA), and antenna.


The Internet of Things (IoT) Dual Core module has the memory and performance to support the increasing demand of cloud connected IoT devices, while using advanced design techniques and process technology to reduce active and idle power. The device is designed for embedded applications that require additional host processor performance and minimal power consumption.

top.jpgThe ISM43903-R48-L54-E/U Wi-Fi module requires no operating system and has an integrated TCP/IP stack. The module can be used with Inventek’s IWIN® AT command set or to develop a custom application on the module using Cypress WICED® Studio SDK.  The module is offered in two versions: With a 2.4 GHz PCB etched antenna on the module or with a connector for an external antenna.  The module has a 14.5mm x 30mm surface mount footprint.


This module is an optimized SoC targeting embedded Internet-of-Things applications in the industrial, medical, sensor, and home appliance markets.

Inventek Systems, expressed enthusiasm for this family of modules due to the increased RAM and processor performance. The additional memory resources and increased functionality meet the technical demands of IoT devices worldwide. Many of our customers are running into issues with the stack allocation requirements for an embedded system and having enough memory allows you to set the stack up properly, to ensure a stable and reliable system. We are excited to see what our customers will build using the additional memory of the ISM4390x family.


Underestimating stack usage can lead to serious run time errors and heap memory overflows can have a significant impact on system behavior. These issues are notoriously difficult to debug, and as the IoT ecosystem continues to grow with additional features, security requirements and expanding cloud libraries and protocols, an emphasis must be placed on the importance of this additional memory. Stretching the limits in programming when it comes to allocated data can cause limitations without this additional memory. The advantage of the ISM4390X family of modules is the amount of RAM, ROM and flash that allows software engineers all the memory they need at a competitive price to develop their IoT product.


The ISM43903-R48-L54-E/U is in full production today.

Contact Inventek Systems for information and support at or call us at 978-667-1962.