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Don't use RESET_N pin (#550)
Data sheet discourages use of SARA modem reset pin, use may lead to irrecoverable state of modem
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variants/mkrnb1500/variant.cpp

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@@ -252,7 +252,8 @@ void initVariant() {
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pinMode(SARA_PWR_ON, OUTPUT);
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digitalWrite(SARA_PWR_ON, LOW);
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// put SARA modem in reset on start to conserve power if it's not used
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// data sheet discourages use of SARA modem reset pin
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// use may lead to irrecoverable state of modem
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pinMode(SARA_RESETN, OUTPUT);
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digitalWrite(SARA_RESETN, LOW);
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