 // OBJECTS & VARIABLES
 /**
  * Peripherals present on REV7
- * - PHT        IO_POWER_UP LOW
- * - LED        Set pin HIGH?
- * - TMP112     read() once.
- * - RFM23B     ??
- * - SIM900     ??
- * - Boiler     ??
+ * - PHT        read from in loop
+ * - LED        Toggle
+ * - TMP112     read from in loop.
+ * - RFM23B     read from in loop
+ * - SIM900     TODO
+ * - Boiler     TODO
  * - XTAL       Setup and leave running?
- * - UART       Disable
+ * - UART       print sensor values
  */
 
 /**

    // Check that the radio is correctly connected; panic if not...
    if(!PrimaryRadio.configure(nPrimaryRadioChannels, RFM23BConfigs) || !PrimaryRadio.begin()) { panic(F("r1")); }

    // Collect full set of environmental values before entering loop() in normal mode.
    // This should also help ensure that sensors are properly initialised.


static const OTRadioLink::OTRadioChannelConfig RFM23BConfigs[nPrimaryRadioChannels] = {
    // GFSK channel 0 full config, RX/TX, not in itself secure.
    OTRadioLink::OTRadioChannelConfig(OTRFM23BLink::StandardRegSettingsGFSK57600, true), };


/**
 * SIM900 instance
 */
// SIM card configs
static const char SIM900_PIN[5] PROGMEM       = "1111";
static const char SIM900_APN[] PROGMEM      = "\"mobiledata\""; // GeoSIM
// UDP Configs - Edit SIM900_UDP_ADDR for relevant server. NOTE: The server IP address should never be committed to GitHub.
static const char SIM900_UDP_ADDR[16] PROGMEM = ""; // Of form "1.2.3.4".
static const char SIM900_UDP_PORT[5] PROGMEM = "9999";             // Standard port for OpenTRV servers
const OTSIM900Link::OTSIM900LinkConfig_t SIM900Config(
                                                false,
                                                SIM900_PIN,
                                                SIM900_APN,
                                                SIM900_UDP_ADDR,
                                                SIM900_UDP_PORT);
OTSIM900Link::OTSIM900Link<8, 5, RADIO_POWER_PIN, OTV0P2BASE::getSecondsLT> SecondaryRadio; // (REGULATOR_POWERUP, RADIO_POWER_PIN);



/*
 * TMP112 instance
