5.2.1. BootUp
Based on the voltage level on the pins
and
, the module boots
up in one of the following modes.
Description
0
0
AT command normal
mode, see chapter
0
1
OTA mode, see chapter
1
0
Provisioning mode, see
chapter
1
1
AT command terminal
mode, see chapter
Table 14: Application modes
A 0 indicates logic LOW level, 1 indicates logical HIGH level.
5.2.2. Idle
In idle mode, Calypso allows the user to configure and use the module using the UART com-
mand interface. The AT-command interface is described in detail in chapter
. A transition to
provisioning or hibernate can be done using the appropriate commands.
5.2.3. OTA update
In this mode of operation, the module allows secure over the air firmware update to be car-
ried out from a device (PC/Mobile) present in the same wireless network (local OTA update).
Further details regarding the OTA update mechanism can be found in chapter
5.2.4. Provisioning
To enable easy provisioning when integrated to an embedded system with limited HMI ca-
pabilities, the Calypso offers a provisioning mode. In this mode, the module acts as an AP
and allows external devices with appropriate credentials to connect and access the on-board
HTTPS server. The user can conveniently browse the settings web-page and configure the
module using any web-browser. More details towards provisioning in chapter
5.2.5. Hibernate
It is essential to have a low power sleep mode especially for a battery powered systems.
Calypso offer a hibernate mode with a very low current consumption of less than 10
µ
A.
Section
describes the commands used to put the module to hibernate and chapter
describes the timing characteristics. On wake-up, the module starts from the reset vector
meaning that the RAM contents are lost. Based on the WiFi connection policy(see
the module can be set up to automatically connect to a saved access point profile and
acquire IP address. However, the socket connections are lost on entering the sleep mode
and have to be re-establish on wake-up.
Calypso reference manual version 1.2
© April 2019
www.we-online.com/wireless-connectivity
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