rosserial Failed to get param: length mismatch error 

When you ran into similar:

[ INFO] [1536180410.761324217]: Parameter ~armRotate/minimumPosition requested.
[ INFO] [1536180410.764781574]: Parameter ~armRotate/maximumPosition requested.
[ INFO] [1536180410.769497296]: Parameter ~armRotate/maximumSpeed requested.
[ INFO] [1536180410.774485261]: Parameter ~armRotate/deadBand requested.
[ INFO] [1536180410.778887785]: Parameter ~armRotate/kP requested.
[ INFO] [1536180410.782668712]: Parameter ~armRotate/kI requested.
[ INFO] [1536180410.787019140]: Parameter ~armRotate/kD requested.
[ INFO] [1536180410.790912621]: Parameter ~armRotate/kGain requested.
[ INFO] [1536180410.794231906]: Parameter ~armRotate/iMin requested.
[ WARN] [1536180410.796379771]: Failed to get param: length mismatch
[ INFO] [1536180412.641243188]: [tiva_arm] Comms stat: avg bandwidth in: 49, out: 1060 bytes/s, loops/sec: 39230.
[ INFO] [1536180415.798788003]: Parameter ~armRotate/minimumPosition requested.
[ INFO] [1536180415.803152207]: Parameter ~armRotate/maximumPosition requested.
[ INFO] [1536180415.807883058]: Parameter ~armRotate/maximumSpeed requested.
[ INFO] [1536180415.811802805]: Parameter ~armRotate/deadBand requested.
[ INFO] [1536180415.815071212]: Parameter ~armRotate/kP requested.
[ INFO] [1536180415.818853175]: Parameter ~armRotate/kI requested.
[ INFO] [1536180415.821947062]: Parameter ~armRotate/kD requested.
[ INFO] [1536180415.824762202]: Parameter ~armRotate/kGain requested.
[ INFO] [1536180415.827612723]: Parameter ~armRotate/iMin requested.
[ WARN] [1536180415.830237542]: Failed to get param: length mismatch


Make sure that your types of your parameters on the MCU and the host matches...
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