Local Build Argon using po-util with OpenThread

[rocksetta]

@nrobinson2000

I just tried to monolithically build the following and it worked:

I did as well. Now what to do with it? Looks like this is the 2nd part to get the RSSI

int8_t rssi = otPlatRadioGetRssi(0);
snprintf(buf, sizeof(buf), ">%d <%d", (int)rssi, lastRssi);

// where buf is an output string.