Ignore interrupts while sending blinds signal

Makes transmission more reliable.

blinds.yaml

@@ -9,6 +9,9 @@ esphome:
   includes:
   - somfy.h
 
+  libraries:
+  - SPI
+
 packages:
   device_base: !include templates/esp8266.yaml
   sensor: !include templates/esp8266-vcc.yaml

somfy.h

@@ -1,3 +1,4 @@
+#include <SPI.h>
 #include "esphome.h"
 
 namespace {
@@ -104,6 +105,8 @@ class SomfyRTS : public Component, public Cover {
         frame[i] ^= frame[i-1];
       }
 
+      noInterrupts();
+
       // Wake-up pulse & silence.
       digitalWrite(rfPin, HIGH);
       delayMicroseconds(9415);
@@ -150,6 +153,8 @@ class SomfyRTS : public Component, public Cover {
         delayMicroseconds(30415);
       }
 
+      interrupts();
+
       // Publish the new rolling code at the end to ensure fast reaction time
       // when the component is called. This method may be synchronous and
       // introduces an unpredictable delay.