Which Transport to Use

USSD / UDP

The SDK includes a modem driver (implemented as a ThingstreamTransport instance) that supports both USSD and UDP communication. This driver is used with a hardware specific modem configuration.

Each SDK includes examples which demonstrate how this can be easily incorporated into a sample application.

One such approach might be:

define a gsm buffer...

#define GSM_BUFFER_LENGTH 2000

static uint8_t gsmBuffer[GSM_BUFFER_LENGTH];

creating a ring or line buffer for callbacks as appropriate...

UDP

transport = Thingstream_createRingBufferTransport(transport,

gsmBuffer, GSM_BUFFER_LENGTH);

USSD

transport = Thingstream_createLineBufferTransport(transport,

gsmBuffer, GSM_BUFFER_LENGTH);

create the appropriate modem transport....

UDP

Define the modem buffer

#define MODEM2_BUFFER_LENGTH 1100

static uint8_t modemBuf[MODEM2_BUFFER_LENGTH];

When creating the transport remember to specify the initialisation routine for a particular UDP modem in this case it's the U-blox Lara-R211 modem.

The full list of supported modem initialisers can be found within the API Documentation provided in the download bundle.

transport = Thingstream_createModem2Transport(transport, 0, modemBuf, sizeof(modemBuf), Thingstream_uBloxLaraR2Init, Platform_debug_printf);

USSD

transport = Thingstream_createModemUssdTransport(transport, 0);