We expect the following env vars to be set:
LOG_HOST # host:port
VAULT_URL # https://vault_host.com:port
VAULT_LS_CERT_PATH # Path to logstash cert (secret/logstash-fwd-crt)
VAULT_TOKEN # token for accessing cred
KAL_GAIN # Gain setting for Kalibrate (try 80)
KAL_BAND # Band to scan with Kalibrate (try GSM850)
SIM808_BAND # Band to scan with SIM808 (try GSM850_MODE)
SIM808_PORT # Device for tty (try /dev/ttyUSB0)
Optionally: LOCATION_NAME # Override the default device naming, which is Resin device ID