Function txPowerUnderCeiling

txPowerUnderCeiling(
    output: Sx127xPaOutput,
    budget: LoraLinkBudget,
    eirpCeilingDbm: number,
): Sx127xTxPower
Chooses the amplifier settings that keep a link's EIRP at or under a ceiling.
Parameters
- output: Sx127xPaOutput
  The amplifier output the module uses.
- budget: LoraLinkBudget
  The link budget, whose transmitting antenna and cable apply.
- eirpCeilingDbm: number
  The EIRP limit in dBm.
Returns Sx127xTxPower
The settings, rounded down to whole decibels.
- Defined in radios/src/sx127x.ts:378