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AT+SEND= ... returns AT_ERROR . why?

jaimadafaca
Associate II

Dear,

I’m working with a B-L072Z-LRWAN1 Discovery Board and AT_Slave sample code of CubeExpansion_LRWAN_V1.2.0.

I being able to JOIN to a Gateway, but when I try to send a frame to the Gateway with command AT+SEND= ...   , the most of trials I get an AT_ERROR even if the equipment is joined.

Also I tried to send each 5 second the command AT+SEND … and for my surprise, only one of these commands is accepted with “OK�? (and received as well on Gateway) approximate each 150 seconds

Does anybody why?

Also I tried to deactivate the Duty cycle restriction with AT+DCS=1 with identical result.

The complete sequence is:

AT<CR><LF>

<CR><LF>

OK<CR><LF>

AT+JOIN<CR><LF>

<CR><LF>

OK<CR><LF>

JOINED<LF><CR>

AT+NJS=?<CR><LF>

1<CR><LF>

<CR><LF>

OK<CR><LF>

AT+SEND=02:Hello World<CR><LF>

<CR><LF>

AT_ERROR<CR><LF>

AT+SEND=02:Hello World<CR><LF>

<CR><LF>

AT_ERROR<CR><LF>

AT+SEND=02:Hello World<CR><LF>

<CR><LF>

AT_ERROR<CR><LF>

AT+SEND=02:Hello World<CR><LF>

<CR><LF>

AT_ERROR<CR><LF>

(150�? aprox)

AT+SEND=02:Hello World<CR><LF>

<CR><LF>

OK<CR><LF>

Does any restriction that I forgotten or other parameters that could produce this behavior?

Thank you in advance,

Regards,

Jai

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