setFrequencyBand() isn't works

[Eugene Lozovoy]

Hello! I’m trying to change frequency band on my mdot with following code (based on latest MTDOT-BOX-EVB-Factory-Firmware):

    int32_t code;
    if ((code = dot->setFrequencyBand(mDot::FB_EU868)) != mDot::MDOT_OK) {
        std::string error = mDot::getReturnCodeString(code) + " - " + dot->getLastError();
        logError("CANNOT SET BAND: %s", error.c_str());
    }
    logTrace("BAND: %s", mDot::FrequencyBandStr(dot->getFrequencyBand()).c_str());

but this code still printing “[TRACE] BAND: US915” on debug uart.

After some exploration I found that setFrequencyBand() in libmDot-GCC_ARM.a from libmDot-mbed5 and libmDot-dev-mbed5 repos have following stub:

Disassembly of section .text._ZN4mDot16setFrequencyBandERKh:

00000000 <mDot::setFrequencyBand(unsigned char const&)>:
   0:   2000            movs    r0, #0
   2:   4770            bx      lr

Does that mean building with gcc isn’t really supported/tested?

[Mike Fiore]

Eugene,

The ability to change the device’s factory configured frequency band isn’t in normal firmware. Can you help us understand why you need to do this?

Cheers,
Mike

[Eugene Lozovoy]

By default gcc-compiled firmware chooses US915 band, but my device (mtdot-box-g-868) intended to work in EU868 band.

[Mike Fiore]

Eugene,

That may mean the flash filesystem on your device has been corrupted. Can you share debug logs so we can diagnose the issue?

Cheers,
Mike

[Eugene Lozovoy]

Resolved by moving to opensource loramac-node stack.

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