Per @Cyberman74
For me it seems LMiC code in radio.c selecting the PA Output pin of SX1276 is erroneous. Always Pin PA_BOOST is selected. This can cause malfunction, if board hardware does not wire this pin, because it uses the RFO_HF / RFO_LF pins only.
Code review and checking datasheet says that current code does not actually activate high-power on PA_BOOST. It always sets RegPaDac bits 2:0 to 4. Datasheet says that to activate high-power on PA_BOOST, RegPaDac bits 2:0 must be set to 7.
However, bit 7 of RegPaConfig is always set to 1, so the output port is always the PA_BOOST at +17dBm (section 5.4.3).
There are a number of constraints on duty cycle, etc., in section 5.4.3 when using +20 dBm mode.
See also #50 (just simple errors in power-setting code).
More entries are needed in the lmic_pinmap structure to specify the board configuration re LF/HF/PA_BOOST pins of the radio. This should be combined with the SPI setting changes for #37.
For additional background see mcci-catena/ibm-lmic#15 and matthijskooijman#33.
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