How to use the sbp.jit.msg.get_s16 function in sbp

def parse_members(cls, buf, offset, length):
    ret = {}
    (__tow, offset, length) = get_u32(buf, offset, length)
    ret['tow'] = __tow
    (__tow_f, offset, length) = get_u8(buf, offset, length)
    ret['tow_f'] = __tow_f
    (__mag_x, offset, length) = get_s16(buf, offset, length)
    ret['mag_x'] = __mag_x
    (__mag_y, offset, length) = get_s16(buf, offset, length)
    ret['mag_y'] = __mag_y
    (__mag_z, offset, length) = get_s16(buf, offset, length)
    ret['mag_z'] = __mag_z
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__dev_vin, offset, length) = get_s16(buf, offset, length)
    ret['dev_vin'] = __dev_vin
    (__cpu_vint, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vint'] = __cpu_vint
    (__cpu_vaux, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vaux'] = __cpu_vaux
    (__cpu_temperature, offset, length) = get_s16(buf, offset, length)
    ret['cpu_temperature'] = __cpu_temperature
    (__fe_temperature, offset, length) = get_s16(buf, offset, length)
    ret['fe_temperature'] = __fe_temperature
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__I, offset, length) = get_s16(buf, offset, length)
    ret['I'] = __I
    (__Q, offset, length) = get_s16(buf, offset, length)
    ret['Q'] = __Q
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__code, offset, length) = get_u8(buf, offset, length)
    ret['code'] = __code
    (__value, offset, length) = get_s16(buf, offset, length)
    ret['value'] = __value
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__dev_vin, offset, length) = get_s16(buf, offset, length)
    ret['dev_vin'] = __dev_vin
    (__cpu_vint, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vint'] = __cpu_vint
    (__cpu_vaux, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vaux'] = __cpu_vaux
    (__cpu_temperature, offset, length) = get_s16(buf, offset, length)
    ret['cpu_temperature'] = __cpu_temperature
    (__fe_temperature, offset, length) = get_s16(buf, offset, length)
    ret['fe_temperature'] = __fe_temperature
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__dev_vin, offset, length) = get_s16(buf, offset, length)
    ret['dev_vin'] = __dev_vin
    (__cpu_vint, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vint'] = __cpu_vint
    (__cpu_vaux, offset, length) = get_s16(buf, offset, length)
    ret['cpu_vaux'] = __cpu_vaux
    (__cpu_temperature, offset, length) = get_s16(buf, offset, length)
    ret['cpu_temperature'] = __cpu_temperature
    (__fe_temperature, offset, length) = get_s16(buf, offset, length)
    ret['fe_temperature'] = __fe_temperature
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__I, offset, length) = get_s16(buf, offset, length)
    ret['I'] = __I
    (__Q, offset, length) = get_s16(buf, offset, length)
    ret['Q'] = __Q
    return ret, offset, length

ret['L'] = __L
    (__cn0, offset, length) = get_u8(buf, offset, length)
    ret['cn0'] = __cn0
    (__lock, offset, length) = get_u16(buf, offset, length)
    ret['lock'] = __lock
    (__sid, offset, length) = GnssSignal.parse_members(buf, offset, length)
    ret['sid'] = __sid
    (__doppler, offset, length) = get_s32(buf, offset, length)
    ret['doppler'] = __doppler
    (__doppler_std, offset, length) = get_u16(buf, offset, length)
    ret['doppler_std'] = __doppler_std
    (__uptime, offset, length) = get_u32(buf, offset, length)
    ret['uptime'] = __uptime
    (__clock_offset, offset, length) = get_s16(buf, offset, length)
    ret['clock_offset'] = __clock_offset
    (__clock_drift, offset, length) = get_s16(buf, offset, length)
    ret['clock_drift'] = __clock_drift
    (__corr_spacing, offset, length) = get_u16(buf, offset, length)
    ret['corr_spacing'] = __corr_spacing
    (__acceleration, offset, length) = get_s8(buf, offset, length)
    ret['acceleration'] = __acceleration
    (__sync_flags, offset, length) = get_u8(buf, offset, length)
    ret['sync_flags'] = __sync_flags
    (__tow_flags, offset, length) = get_u8(buf, offset, length)
    ret['tow_flags'] = __tow_flags
    (__track_flags, offset, length) = get_u8(buf, offset, length)
    ret['track_flags'] = __track_flags
    (__nav_flags, offset, length) = get_u8(buf, offset, length)
    ret['nav_flags'] = __nav_flags
    (__pset_flags, offset, length) = get_u8(buf, offset, length)
    ret['pset_flags'] = __pset_flags
    (__misc_flags, offset, length) = get_u8(buf, offset, length)

def parse_members(cls, buf, offset, length):
    ret = {}
    (__i, offset, length) = get_s16(buf, offset, length)
    ret['i'] = __i
    (__f, offset, length) = get_u8(buf, offset, length)
    ret['f'] = __f
    return ret, offset, length

def parse_members(cls, buf, offset, length):
    ret = {}
    (__hydro, offset, length) = get_s16(buf, offset, length)
    ret['hydro'] = __hydro
    (__wet, offset, length) = get_s8(buf, offset, length)
    ret['wet'] = __wet
    return ret, offset, length